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Important Questions: The Triangle and Its Properties


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20 Questions MCQ Test Mathematics (Maths) Class 7 | Important Questions: The Triangle and Its Properties

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Important Questions: The Triangle and Its Properties - Question 1

Find the measure of the angle x in the given figure.

                           

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 1

∠EFD+∠FED = x  
(Exterior angle property of a triangle) 
⇒ 28o+42= ∠x or ∠x = 70o

Important Questions: The Triangle and Its Properties - Question 2

Which of the following options is INCORRECT? 

                    

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 2

∠1 =∠2 and  ∠2 =∠3  [Alternate angles]
So, ∠1 =∠3  and  ∠1+∠4+∠5 = 180o  [Angle sum property]
Also, ∠8 = ∠6

Important Questions: The Triangle and Its Properties - Question 3

In the figure (not drawn to scale), ADF and BEF are triangles and EC = ED, find y.

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 3

In ΔCED, CE=ED 
∴ ∠EDC = ∠ECD  
[Angles opposite to equal sides are equal] ⇒ ∠ECD = 28
 Also,  ∠ECD = ∠BCA (Vertically opposite angles) ⇒ ∠BCA = 28
In ΔBCA, y = 62o+28o 
Exterior angle property] ⇒ y = 90o

Important Questions: The Triangle and Its Properties - Question 4

In a ΔABC,which of the given condition holds?

Important Questions: The Triangle and Its Properties - Question 5

In the figure (not drawn to scale), ABC is an equilateral triangle and ABD is an isosceles triangle with DA = DB, find x. 

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 5

Since ABC is an equilateral triangle. 
∴ ∠CAB =∠ABC =∠BCA = 60 
And ∠DBA = ∠DAB = (60o−x) 
[∵ DA = DB] 
In ΔDAB, ∠DAB∠DAB+∠ADB =180  
⇒ 2(60o−x)+88= 180o 
⇒ 2(60o−x) = 92o
⇒ 60o−x = 46⇒ x = 14o

Important Questions: The Triangle and Its Properties - Question 6

ABC is an isosceles triangle with AB = AC and AD is altitude, then ____.

Important Questions: The Triangle and Its Properties - Question 7

In the figure (not drawn to scale), ABCD is a square, ADE is an equilateral triangle and BFE is a straight line, find y. 

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 7

In ΔAEB, 

 ∠A=∠DAE+∠BAD ⇒ ∠A=60o+90o=15
And,  AE=AB ⇒ ∠ABE=∠AEB  
[Angles opposite to equal sides are equal]
Now, ∠A+∠ABE+∠AEB=180  (Angle sum property) 
⇒ 2∠AEB=180−150= 30o ⇒ ∠AEB = 15 
Now, ∠E=60⇒ ∠DEF=60o−15= 45
∴ In ΔEFD, ∠DEF+∠EDF+∠EFD
= 180⇒ 45o+60o+y = 180
⇒ y = 180o−(45o+60o) = 75o

Important Questions: The Triangle and Its Properties - Question 8

Find the measure of the angle x in the given figure.  

                                  

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 8

∠UXV = y (Vertically opposite angles) 
∴ y = 45In ΔXYZ y+x+63o = 180 
(Angle sum property) 
⇒ 45o+x+63= 180o
⇒ x = 180o−(45o+63o
⇒  x= 180o−108= 72o

Important Questions: The Triangle and Its Properties - Question 9

The given figure shows three identical squares. Find x. 

       

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 9

We have, ABCD, CEFG and CIHJ are all squares. 

 So, ∠1+∠2+x=90???
(i) 36o+∠1+x=90o q ??.
(ii) x+∠2+27o=90??.
(iii) Adding (ii) and (iii),
we get 36o+x+27o+(∠A+∠2+x)=180
⇒ 63o+x+90o=180
(From (i)) ⇒ x=180o−153= 27o

Important Questions: The Triangle and Its Properties - Question 10

In the figure (not drawn to scale), EFA is a right-angled triangle with ∠EFA=90o and FGB is an equilateral triangle, find  y−2x. 

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 10

In ΔFGC, ∠CBF = 60o
(Angle of equilateral triangle)  
∴  x+60o+92= 180o      
⇒ x = 180o−152o=  28o        
Now, In ΔBCF, ∠CBF = 60o            
∠FCB = 180o−92o  (Linear pair)            
⇒ ∠FCB=88o          
∴ ∠BFC+88o+60o=180o                       
(Angle sum property)      
⇒ ∠BFC=180o−148= 32o
And ∠AFE = 90o ⇒ y+32= 90o
⇒ y = 90o−32= 58o
∴ y−2x = 58o−2×28= 58o−56= 2o

Important Questions: The Triangle and Its Properties - Question 11

In the figure (not drawn to scale), ABC and DEF are two triangles, CA is parallel to FD and CFBE is a straight line. Find the value of x+y

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 11

∠FCA = ∠BFD  
(Corresponding angles) 
⇒ x = 51o 
Now, in ΔABC y = 51o+83o (Exterior angle property) 
⇒ y = 134So, x+y = 51o+134= 185o

Important Questions: The Triangle and Its Properties - Question 12

In a ΔABC,if AB+BC = 10 cm, BC+CA = 12 cm,CA+AB = 16 cm, then the perimeter of the triangle is ____.

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 12

It is given that, 
AB+BC = 10cm   ?..(i) 
BC+CA = 12cm    ?..(ii) 
CA+AB = 16cm      ?..(iii)
Adding (i), (ii) and (iii); we get 
2(AB+BC+CA) = 10+12+16 
⇒ AB+BC+CA = 19cm

Important Questions: The Triangle and Its Properties - Question 13

In the figure, not drawn to scale, ACDF is a rectangle and BDE is a triangle. Find ∠BED 

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 13

∠CDB+∠BDE = 90 
(Angle of a rectangle) 
⇒ 48o+∠BDE = 90o 
⇒ ∠BDE = 90o−48= 42o 
In ΔBED ∠EBD+∠BDE+∠BED = 180o  
(Angle sum property) 
⇒ 86o+42o+∠BED = 180
⇒ ∠BED = 180o−(86o+42o) = 52o

Important Questions: The Triangle and Its Properties - Question 14

In the figure, ABCD is a square, MDC is an equilateral triangle. Find the value of x.

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 14

∆MDC is an equilateral triangle. therefore all the angles will be 60°.

angle MCB=BCD-MCD

=90-60 = 30°

NOW,

In ∆BCD,

BC=CD

Therefore angle XBC = 45°.

when angle sum is applied in ∆CBX, X=105°

Important Questions: The Triangle and Its Properties - Question 15

Find the measure of ∠LNM in the given figure.

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 15

∠KLO = ∠MLN 
∴ ∠MLN = 70o in ∠LMN,∠MLN+∠LNM+∠LMN = 180
(Angle sum property) 
⇒ 70o+∠LNM+50o=180o
 
⇒ ∠LNM = 180o−(70o+50o) = 60o

Important Questions: The Triangle and Its Properties - Question 16

A 26 m long ladder reached a window 24 m from the ground on placing it against a wall. Find the distance of the foot of the ladder from the wall.

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 16

In ΔPRQ,  PR= PQ2+QR

(By Pythagoras theorem) 
(26)=(24)2+QRor QR
= 676−576 = 100 
⇒ QR = √100 ⇒ QR = 10
∴ The distance of the foot of the ladder from the wall is 10 m.

Important Questions: The Triangle and Its Properties - Question 17

A tree is broken at a height of 5 m from the ground and its top touches the ground at a distance of 12 m from the base of the tree. Find the original height of the tree.

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 17

Let KB is original height of the tree. In ΔABC, 

AC= AB2+BC= 52+122 =25+144=169
∴ AC = √169 = 13m 
KB = KA+AB = (13+5)m = 18m
∴ Original height of the tree is 18m.

Important Questions: The Triangle and Its Properties - Question 18

Aryan wants to plant a flower on the ground in the form of a rhombus. The diagonals of the rhombus measures 42 cm and 56 cm. Find the perimeter of the field.

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 18

Since diagonals of a rhombus bisect each other at 90
Given: BD = 42 cm and AC = 56 cm 

∴ BK = 1/2 BD = 42/2 = 21cm 
AK=1/2 AC = 56/2 = 28 cm  
In ΔKAB,AB= AK2+BK= (28)2+(21)2=784+441=1225 
∴ AB=√1225 = 35cm 
∴  Perimeter of the field ABCD = 4×35 = 140 cm;

Important Questions: The Triangle and Its Properties - Question 19

A 34 m long ladder reached a window 16 m from the ground on placing it against a wall. Find the distance of the foot of the ladder from the wall.

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 19

Let AB = length of ladder, AC = height of window 
 
 In ΔABC, (AB)= (AC)2+(BC)2
⇒ (34)2  =(16)2+BC
or  
BC= (34)2−(16)⇒ BC= 1156−256 = 900 
∴ BC = √900 = 30m

Important Questions: The Triangle and Its Properties - Question 20

Mrs Kaushik gives a problem to her students. Find the perimeter of a rectangle whose length is 28 cm and diagonal is 35 cm. What will be the correct answer?

Detailed Solution for Important Questions: The Triangle and Its Properties - Question 20

ABCD is a rectangle, 


In ΔACB, AC= AB2+BC2  (By Pythagoras theorem)
(35)= (28)2+BC2 or  BC= (35)2−(28)2
⇒ BC= 1225−784 ⇒ BC= 441
∴ BC==21cm
∴  Perimeter of rectangle 
= 2×(28+21)cm = 2×(49)cm = 98cm

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