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RS Aggarwal Solutions: Quadrilaterals- 2 | Mathematics (Maths) Class 9 PDF Download

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 Page 1


 ?  
           
  
 
  
     
 ?   
                                              
          
 
Question:11
In the adjoining figure, ABCD is a parallelogram in which ?A = 72°. Calculate ?B, ?C and ?D.
Solution:
ABCD is parallelogram and ?A = 72° ?.
We know that opposite angles of a parallelogram are equal.
? ?A ?= ?C and ?B ?= ?D ? ? ? ?C = 72
o
?A and ?B are adajcent angles.
i.e., ?A ?+ ?B ? = 180
o
? ?B = 180
o 
 - ?A
? ?B ? = 180
o
 - 72
o
 = 108
o
? ? ?B ? = ? ?D = 108
o
Hence, ?B ? = ? ?D = 108
o
? and ?C ? = 72
o
? Question:12
In the adjoining figure, ABCD is a parallelogram in which ?DAB = 80° and ?DBC = 60°. Calculate ?CDB and
?ADB.
Solution:
Given:  ABCD is parallelogram and ?DAB = 80° ? and ?DBC = 60°
To find: Measure of ?CDB and ?ADB
In parallelogram ABCD, AD || ? BC
? ?DBC = ? ADB = 60
o
    
Alternateinteriorangles     ...
i
As ?DAB and ?ADC are adajcent angles, ?DAB ?+ ?ADC ? = 180
o
? ?ADC = 180
o 
 - ?DAB
?    ? ?ADC ? = 180
o
 - 80
o
 = 100
o
Also, ?ADC ? = ?ADB + ?C ??DB
Page 2


 ?  
           
  
 
  
     
 ?   
                                              
          
 
Question:11
In the adjoining figure, ABCD is a parallelogram in which ?A = 72°. Calculate ?B, ?C and ?D.
Solution:
ABCD is parallelogram and ?A = 72° ?.
We know that opposite angles of a parallelogram are equal.
? ?A ?= ?C and ?B ?= ?D ? ? ? ?C = 72
o
?A and ?B are adajcent angles.
i.e., ?A ?+ ?B ? = 180
o
? ?B = 180
o 
 - ?A
? ?B ? = 180
o
 - 72
o
 = 108
o
? ? ?B ? = ? ?D = 108
o
Hence, ?B ? = ? ?D = 108
o
? and ?C ? = 72
o
? Question:12
In the adjoining figure, ABCD is a parallelogram in which ?DAB = 80° and ?DBC = 60°. Calculate ?CDB and
?ADB.
Solution:
Given:  ABCD is parallelogram and ?DAB = 80° ? and ?DBC = 60°
To find: Measure of ?CDB and ?ADB
In parallelogram ABCD, AD || ? BC
? ?DBC = ? ADB = 60
o
    
Alternateinteriorangles     ...
i
As ?DAB and ?ADC are adajcent angles, ?DAB ?+ ?ADC ? = 180
o
? ?ADC = 180
o 
 - ?DAB
?    ? ?ADC ? = 180
o
 - 80
o
 = 100
o
Also, ?ADC ? = ?ADB + ?C ??DB
? ? ?ADC ? = ? 100
o
 
? ?ADB + ?C ??DB = 100
o
              ...ii
From i
and ii
, we get:
60
o
 + ?C ??DB = 100
o
 
? ?C ??DB = 100
o
 - 60
o
 = 40
o
Hence, ?CDB ? = ? 40
o
 and ?ADB ? = 60
o
? Question:13
In the adjoining figure, M is the midpoint of side BC of a parallelogram ABCD such that ?BAM = ?DAM. Prove that
AD = 2CD.
Solution:
Given: parallelogram ABCD, M is the midpoint of side BC and ?BAM = ?DAM.
To prove: AD = 2CD
 
Proof:
Since, AD ? BC
 and AM is the transversal.
So, ?DAM = ?AMB
      Alternateinteriorangles
But, ?DAM = ?BAM
 Given
Therefore, ?AMB = ?BAM
? AB = BM
             Anglesoppositetoequalsidesareequal.
    ...1
Now, AB = CD       Oppositesidesofaparallelogramareequal.
Page 3


 ?  
           
  
 
  
     
 ?   
                                              
          
 
Question:11
In the adjoining figure, ABCD is a parallelogram in which ?A = 72°. Calculate ?B, ?C and ?D.
Solution:
ABCD is parallelogram and ?A = 72° ?.
We know that opposite angles of a parallelogram are equal.
? ?A ?= ?C and ?B ?= ?D ? ? ? ?C = 72
o
?A and ?B are adajcent angles.
i.e., ?A ?+ ?B ? = 180
o
? ?B = 180
o 
 - ?A
? ?B ? = 180
o
 - 72
o
 = 108
o
? ? ?B ? = ? ?D = 108
o
Hence, ?B ? = ? ?D = 108
o
? and ?C ? = 72
o
? Question:12
In the adjoining figure, ABCD is a parallelogram in which ?DAB = 80° and ?DBC = 60°. Calculate ?CDB and
?ADB.
Solution:
Given:  ABCD is parallelogram and ?DAB = 80° ? and ?DBC = 60°
To find: Measure of ?CDB and ?ADB
In parallelogram ABCD, AD || ? BC
? ?DBC = ? ADB = 60
o
    
Alternateinteriorangles     ...
i
As ?DAB and ?ADC are adajcent angles, ?DAB ?+ ?ADC ? = 180
o
? ?ADC = 180
o 
 - ?DAB
?    ? ?ADC ? = 180
o
 - 80
o
 = 100
o
Also, ?ADC ? = ?ADB + ?C ??DB
? ? ?ADC ? = ? 100
o
 
? ?ADB + ?C ??DB = 100
o
              ...ii
From i
and ii
, we get:
60
o
 + ?C ??DB = 100
o
 
? ?C ??DB = 100
o
 - 60
o
 = 40
o
Hence, ?CDB ? = ? 40
o
 and ?ADB ? = 60
o
? Question:13
In the adjoining figure, M is the midpoint of side BC of a parallelogram ABCD such that ?BAM = ?DAM. Prove that
AD = 2CD.
Solution:
Given: parallelogram ABCD, M is the midpoint of side BC and ?BAM = ?DAM.
To prove: AD = 2CD
 
Proof:
Since, AD ? BC
 and AM is the transversal.
So, ?DAM = ?AMB
      Alternateinteriorangles
But, ?DAM = ?BAM
 Given
Therefore, ?AMB = ?BAM
? AB = BM
             Anglesoppositetoequalsidesareequal.
    ...1
Now, AB = CD       Oppositesidesofaparallelogramareequal.
? 2AB = 2CD ? (AB +AB) = 2CD
? BM +MC = 2CD
      (AB = BM and MC = BM)
? BC = 2CD ? AD = 2CD       (AD = BC, Opposite sides of a parallelogram are equal. )
Question:14
In the adjoining figure, ABCD is a parallelogram in which ?A = 60°. If the bisectors of ?A and ?B meet DC at P,
prove that
i ?APB = 90°,
ii AD = DP and PB = PC = BC,
iii DC = 2AD.
Solution:
ABCD is a parallelogram.
? ??A = ??C and ?B = ? ?D Oppositeangles
And ??A + ??B = 180
o
                Adjacentanglesaresupplementary
? ??B = 180
o
 - ?A 
? 180
o
 - 60
o
 = 120
o
             ( ? ?A = 60
o
)
? ??A = ??C = 60
o
 and ?B = ? ?D ? = 120
o
i
 In ? APB, ? ?PAB = 
60°
2
= 30°
and ?PBA = 
120°
2
= 60°
   ? ? ? ?APB ? = 180
o
 - (30
o
 + 60
o
) = 90
o
ii
 In ? ADP, ? ?PAD = 30
o
 and ?ADP = 120
o
    ? ?APB = 180
o
 - (30
o
 + 120
o
) = 30
o
   Thus, ? ?PAD = ??APB = ?30
o
   Hence, ?ADP is an isosceles triangle and AD = DP.
   In ? PBC, ? ? PBC = 60
o
,  ? ? BPC = 180
o
 - (90
o
 +30
o
) = 60
o 
and
 
? ? BCP  = 60
o
 (Opposite angle of ?A)
   ? ? PBC = ? ? BPC = ? ? BCP
   Hence, ?PBC is an equilateral triangle and, therefore, PB = PC = BC. ? iii
DC = DP + PC
     From ii
, we have:
    DC = AD + BC                     [AD = BC, opposite sides of a parallelogram]
    ? DC = AD + AD
    ? DC = 2 AD
Question:15
Page 4


 ?  
           
  
 
  
     
 ?   
                                              
          
 
Question:11
In the adjoining figure, ABCD is a parallelogram in which ?A = 72°. Calculate ?B, ?C and ?D.
Solution:
ABCD is parallelogram and ?A = 72° ?.
We know that opposite angles of a parallelogram are equal.
? ?A ?= ?C and ?B ?= ?D ? ? ? ?C = 72
o
?A and ?B are adajcent angles.
i.e., ?A ?+ ?B ? = 180
o
? ?B = 180
o 
 - ?A
? ?B ? = 180
o
 - 72
o
 = 108
o
? ? ?B ? = ? ?D = 108
o
Hence, ?B ? = ? ?D = 108
o
? and ?C ? = 72
o
? Question:12
In the adjoining figure, ABCD is a parallelogram in which ?DAB = 80° and ?DBC = 60°. Calculate ?CDB and
?ADB.
Solution:
Given:  ABCD is parallelogram and ?DAB = 80° ? and ?DBC = 60°
To find: Measure of ?CDB and ?ADB
In parallelogram ABCD, AD || ? BC
? ?DBC = ? ADB = 60
o
    
Alternateinteriorangles     ...
i
As ?DAB and ?ADC are adajcent angles, ?DAB ?+ ?ADC ? = 180
o
? ?ADC = 180
o 
 - ?DAB
?    ? ?ADC ? = 180
o
 - 80
o
 = 100
o
Also, ?ADC ? = ?ADB + ?C ??DB
? ? ?ADC ? = ? 100
o
 
? ?ADB + ?C ??DB = 100
o
              ...ii
From i
and ii
, we get:
60
o
 + ?C ??DB = 100
o
 
? ?C ??DB = 100
o
 - 60
o
 = 40
o
Hence, ?CDB ? = ? 40
o
 and ?ADB ? = 60
o
? Question:13
In the adjoining figure, M is the midpoint of side BC of a parallelogram ABCD such that ?BAM = ?DAM. Prove that
AD = 2CD.
Solution:
Given: parallelogram ABCD, M is the midpoint of side BC and ?BAM = ?DAM.
To prove: AD = 2CD
 
Proof:
Since, AD ? BC
 and AM is the transversal.
So, ?DAM = ?AMB
      Alternateinteriorangles
But, ?DAM = ?BAM
 Given
Therefore, ?AMB = ?BAM
? AB = BM
             Anglesoppositetoequalsidesareequal.
    ...1
Now, AB = CD       Oppositesidesofaparallelogramareequal.
? 2AB = 2CD ? (AB +AB) = 2CD
? BM +MC = 2CD
      (AB = BM and MC = BM)
? BC = 2CD ? AD = 2CD       (AD = BC, Opposite sides of a parallelogram are equal. )
Question:14
In the adjoining figure, ABCD is a parallelogram in which ?A = 60°. If the bisectors of ?A and ?B meet DC at P,
prove that
i ?APB = 90°,
ii AD = DP and PB = PC = BC,
iii DC = 2AD.
Solution:
ABCD is a parallelogram.
? ??A = ??C and ?B = ? ?D Oppositeangles
And ??A + ??B = 180
o
                Adjacentanglesaresupplementary
? ??B = 180
o
 - ?A 
? 180
o
 - 60
o
 = 120
o
             ( ? ?A = 60
o
)
? ??A = ??C = 60
o
 and ?B = ? ?D ? = 120
o
i
 In ? APB, ? ?PAB = 
60°
2
= 30°
and ?PBA = 
120°
2
= 60°
   ? ? ? ?APB ? = 180
o
 - (30
o
 + 60
o
) = 90
o
ii
 In ? ADP, ? ?PAD = 30
o
 and ?ADP = 120
o
    ? ?APB = 180
o
 - (30
o
 + 120
o
) = 30
o
   Thus, ? ?PAD = ??APB = ?30
o
   Hence, ?ADP is an isosceles triangle and AD = DP.
   In ? PBC, ? ? PBC = 60
o
,  ? ? BPC = 180
o
 - (90
o
 +30
o
) = 60
o 
and
 
? ? BCP  = 60
o
 (Opposite angle of ?A)
   ? ? PBC = ? ? BPC = ? ? BCP
   Hence, ?PBC is an equilateral triangle and, therefore, PB = PC = BC. ? iii
DC = DP + PC
     From ii
, we have:
    DC = AD + BC                     [AD = BC, opposite sides of a parallelogram]
    ? DC = AD + AD
    ? DC = 2 AD
Question:15
In the adjoining figure, ABCD is a parallelogram in which ?BAO = 35°, ?DAO = 40° and ?COD = 105°. Calculate
i ?ABO,
ii ?ODC,
iii ?ACB,
iv ?CBD.
Solution:
ABCD is a parallelogram.
? AB | | ? DC and BC ?| | ? AD
i
In ?AOB, ?BAO = 35°, ??AOB = ?COD = 105°  Verticallyoppositeangels
? ??ABO = 180
o
 - (35
o
 + 105
o
) = 40
o
ii
?ODC and ?ABO are alternate interior angles.
? ?ODC = ?ABO = 40
o
iii
 ?ACB = ? ?CAD = 40
o                             
Alternateinteriorangles
iv
 ?CBD = ?ABC - ?ABD            ...i
     ?ABC = 180
o
 - ?BAD 
  
                     Adjacentanglesaresupplementary
  ? ? ?ABC = 180
o
 - 75
o
 = 105
o  
 
? ?CBD = 105
o
 - ?ABD                         ( ?ABD = ?ABO)
? ?CBD = 105
o
 - 40
o
 =  65
o
Question:16
In a || gm ABCD, if ?A = (2x + 25)° and ?B = (3x - 5)°, find the value of x and the measure of each angle of the
parallelogram.
Solution:
ABCD is a parallelogram.
i.e., ?A = ?C and ?B = ?D                  Oppositeangles
Also, ?A + ?B = 180
o
                            Adjacentanglesaresupplementary
  ? ? ? (2x + 25)° ? + (3x - 5)° ? = 180
? ?5x +20 = 180
? ? 5x = 160
? ? x = 32
o
? ??A = 2 ? 32 + 25 = 89
o
 and ?B = 3 ? 32 - 5 = 91
o
Hence, x = 32
o
, ?A = ?C = 89
o
 and ?B = ?D = 91
o
 
Question:17
If an angle of a parallelogram is four-fifths of its adjacent angle, find the angles of the parallelogram.
Page 5


 ?  
           
  
 
  
     
 ?   
                                              
          
 
Question:11
In the adjoining figure, ABCD is a parallelogram in which ?A = 72°. Calculate ?B, ?C and ?D.
Solution:
ABCD is parallelogram and ?A = 72° ?.
We know that opposite angles of a parallelogram are equal.
? ?A ?= ?C and ?B ?= ?D ? ? ? ?C = 72
o
?A and ?B are adajcent angles.
i.e., ?A ?+ ?B ? = 180
o
? ?B = 180
o 
 - ?A
? ?B ? = 180
o
 - 72
o
 = 108
o
? ? ?B ? = ? ?D = 108
o
Hence, ?B ? = ? ?D = 108
o
? and ?C ? = 72
o
? Question:12
In the adjoining figure, ABCD is a parallelogram in which ?DAB = 80° and ?DBC = 60°. Calculate ?CDB and
?ADB.
Solution:
Given:  ABCD is parallelogram and ?DAB = 80° ? and ?DBC = 60°
To find: Measure of ?CDB and ?ADB
In parallelogram ABCD, AD || ? BC
? ?DBC = ? ADB = 60
o
    
Alternateinteriorangles     ...
i
As ?DAB and ?ADC are adajcent angles, ?DAB ?+ ?ADC ? = 180
o
? ?ADC = 180
o 
 - ?DAB
?    ? ?ADC ? = 180
o
 - 80
o
 = 100
o
Also, ?ADC ? = ?ADB + ?C ??DB
? ? ?ADC ? = ? 100
o
 
? ?ADB + ?C ??DB = 100
o
              ...ii
From i
and ii
, we get:
60
o
 + ?C ??DB = 100
o
 
? ?C ??DB = 100
o
 - 60
o
 = 40
o
Hence, ?CDB ? = ? 40
o
 and ?ADB ? = 60
o
? Question:13
In the adjoining figure, M is the midpoint of side BC of a parallelogram ABCD such that ?BAM = ?DAM. Prove that
AD = 2CD.
Solution:
Given: parallelogram ABCD, M is the midpoint of side BC and ?BAM = ?DAM.
To prove: AD = 2CD
 
Proof:
Since, AD ? BC
 and AM is the transversal.
So, ?DAM = ?AMB
      Alternateinteriorangles
But, ?DAM = ?BAM
 Given
Therefore, ?AMB = ?BAM
? AB = BM
             Anglesoppositetoequalsidesareequal.
    ...1
Now, AB = CD       Oppositesidesofaparallelogramareequal.
? 2AB = 2CD ? (AB +AB) = 2CD
? BM +MC = 2CD
      (AB = BM and MC = BM)
? BC = 2CD ? AD = 2CD       (AD = BC, Opposite sides of a parallelogram are equal. )
Question:14
In the adjoining figure, ABCD is a parallelogram in which ?A = 60°. If the bisectors of ?A and ?B meet DC at P,
prove that
i ?APB = 90°,
ii AD = DP and PB = PC = BC,
iii DC = 2AD.
Solution:
ABCD is a parallelogram.
? ??A = ??C and ?B = ? ?D Oppositeangles
And ??A + ??B = 180
o
                Adjacentanglesaresupplementary
? ??B = 180
o
 - ?A 
? 180
o
 - 60
o
 = 120
o
             ( ? ?A = 60
o
)
? ??A = ??C = 60
o
 and ?B = ? ?D ? = 120
o
i
 In ? APB, ? ?PAB = 
60°
2
= 30°
and ?PBA = 
120°
2
= 60°
   ? ? ? ?APB ? = 180
o
 - (30
o
 + 60
o
) = 90
o
ii
 In ? ADP, ? ?PAD = 30
o
 and ?ADP = 120
o
    ? ?APB = 180
o
 - (30
o
 + 120
o
) = 30
o
   Thus, ? ?PAD = ??APB = ?30
o
   Hence, ?ADP is an isosceles triangle and AD = DP.
   In ? PBC, ? ? PBC = 60
o
,  ? ? BPC = 180
o
 - (90
o
 +30
o
) = 60
o 
and
 
? ? BCP  = 60
o
 (Opposite angle of ?A)
   ? ? PBC = ? ? BPC = ? ? BCP
   Hence, ?PBC is an equilateral triangle and, therefore, PB = PC = BC. ? iii
DC = DP + PC
     From ii
, we have:
    DC = AD + BC                     [AD = BC, opposite sides of a parallelogram]
    ? DC = AD + AD
    ? DC = 2 AD
Question:15
In the adjoining figure, ABCD is a parallelogram in which ?BAO = 35°, ?DAO = 40° and ?COD = 105°. Calculate
i ?ABO,
ii ?ODC,
iii ?ACB,
iv ?CBD.
Solution:
ABCD is a parallelogram.
? AB | | ? DC and BC ?| | ? AD
i
In ?AOB, ?BAO = 35°, ??AOB = ?COD = 105°  Verticallyoppositeangels
? ??ABO = 180
o
 - (35
o
 + 105
o
) = 40
o
ii
?ODC and ?ABO are alternate interior angles.
? ?ODC = ?ABO = 40
o
iii
 ?ACB = ? ?CAD = 40
o                             
Alternateinteriorangles
iv
 ?CBD = ?ABC - ?ABD            ...i
     ?ABC = 180
o
 - ?BAD 
  
                     Adjacentanglesaresupplementary
  ? ? ?ABC = 180
o
 - 75
o
 = 105
o  
 
? ?CBD = 105
o
 - ?ABD                         ( ?ABD = ?ABO)
? ?CBD = 105
o
 - 40
o
 =  65
o
Question:16
In a || gm ABCD, if ?A = (2x + 25)° and ?B = (3x - 5)°, find the value of x and the measure of each angle of the
parallelogram.
Solution:
ABCD is a parallelogram.
i.e., ?A = ?C and ?B = ?D                  Oppositeangles
Also, ?A + ?B = 180
o
                            Adjacentanglesaresupplementary
  ? ? ? (2x + 25)° ? + (3x - 5)° ? = 180
? ?5x +20 = 180
? ? 5x = 160
? ? x = 32
o
? ??A = 2 ? 32 + 25 = 89
o
 and ?B = 3 ? 32 - 5 = 91
o
Hence, x = 32
o
, ?A = ?C = 89
o
 and ?B = ?D = 91
o
 
Question:17
If an angle of a parallelogram is four-fifths of its adjacent angle, find the angles of the parallelogram.
Solution:
 Let ABCD be a parallelogram. 
? ? ?A = ?C and ?B = ?D           Oppositeangles
Let ?A = x
o
 and ?B = 
4x
5
°
Now, ? ?A + ?B = 180
o
                 Adjacentanglesaresupplementary
  ? x + 
4x
5
 = 180
o
?
9x
5
 = 180
o
? x = 100
o
Now, ?A = 100
o
 and ?B = 
4
5
×100° = 80
o
 Hence, ?A = ?C = 100
o
; ?B = ?D = 80
o
Question:18
Find the measure of each angle of a parallelogram, if one of its angles is 30° less than twice the smallest angle.
Solution:
 Let ABCD be a parallelogram. 
 ? ? ?A = ? ?C and ?B = ?D          Oppositeangles
 Let ?A be the smallest angle whose measure is x
o
.
 ? ? ? ?B = (2x - 30)
o
Now, ? ?A + ?B = 180
o
                Adjacentanglesaresupplementary
 
   ? x + 2x - 30
o
 = 180
o
   ? 3x = 210
o
   ? x = 70
o
? ?? ?B = 2 ? 70
o
 - 30
o
 = 110
o
 Hence, ?A = ?C = 70
o
; ?B = ?D = 110
o
Question:19
ABCD is a parallelogram in which AB = 9.5 cm and its perimeter is 30 cm. Find the length of each side of the
parallelogram.
Solution:
ABCD is a parallelogram.
The opposite sides of a parallelogram are parallel and equal.
? AB = DC = 9.5 cm
Let BC = AD = x
? ? Perimeter of ABCD = AB + BC + CD + DA = 30 cm
? 9.5 + x + 9.5 + x = 30
? 19 + 2x = 30
? 2x = 11
? x = 5.5 cm
Hence, AB = DC = 9.5 cm and BC = DA = 5.5 cm
Question:20
In each of the figures given below, ABCD is a rhombus. Find the value of x and y in each case.
( )
( )
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FAQs on RS Aggarwal Solutions: Quadrilaterals- 2 - Mathematics (Maths) Class 9

1. What are the different types of quadrilaterals?
Ans. There are several types of quadrilaterals, including squares, rectangles, parallelograms, trapeziums, and rhombuses. Each type has its own unique properties and characteristics.
2. How do you identify a parallelogram?
Ans. A parallelogram is a quadrilateral where both pairs of opposite sides are parallel. Additionally, the opposite sides of a parallelogram are equal in length. To identify a parallelogram, you can check if both pairs of opposite sides are parallel or if the opposite sides are equal in length.
3. What is the sum of the interior angles of a quadrilateral?
Ans. The sum of the interior angles of any quadrilateral is always equal to 360 degrees. This means that if you measure the angles of a quadrilateral and add them up, the total sum will always be 360 degrees.
4. How do you find the area of a rectangle?
Ans. To find the area of a rectangle, you multiply the length of one of its sides (usually called the base) by the length of another side (usually called the height). The formula for finding the area of a rectangle is: Area = Length × Width.
5. What is the difference between a square and a rhombus?
Ans. A square is a type of rhombus where all four sides are equal in length and all four angles are right angles (90 degrees). However, a rhombus is a quadrilateral where all four sides are equal in length, but the angles are not necessarily right angles. In other words, all squares are rhombuses, but not all rhombuses are squares.
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