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QUESTION: 1

Two parallelograms are on equal bases and between the same parallels. The ratio of their areas is:

Solution:

Two parallelograms are on equal bases and between the same parallels.

i.e., their corresponding heights must be the same.

Thus, areas of both parallelograms are equal. Hence, the ratio of their areas is 1:1.

QUESTION: 2

In the figure, ABC and BDE are two equilateral triangles such that D is the midpoint of BC. If AE intersects BC at F, then

Solution:

Let the altitude of the triangle ABC is h

Then altitude of the triangle BED = h/2

Now, ar(Δ FED) = (1/2)*FD*(h/2) = (FD * h)/2

and ar(Δ AFC) = (1/2)*FC*h

= (1/2)*(FD + DC)*h

= (1/2)*(FD + BD)*h

= (1/2)*(FD + BF + FD)*h

= (1/2)*(2FD + BF)*h

= (1/2)*(2FD + 2FD)*h

= 2FD*H

⇒ ar(Δ AFC)/8 = 2FD*H/8

⇒ ar(Δ AFC)/8 = 2FD*H/4

⇒ ar(Δ AFC)/8 = ar(Δ FED)

QUESTION: 3

In parallelogram ABCD, AL ⊥ CD and CM ⊥ AD. If AL=20cm, CD = 12 cm, CM=8cm, then perimeter of the parallelogram is

Solution:

Given that ABCD is a IIgm

AL = 20 cm

CD = 12 cm

CM = 8 cm

Area of IIgm ABCD will be = BASE * ALTITUDE

= AL * CD

= 20 * 12= 240 cm2

Again taking base AD and Altitude MC

than Ar IIgm ABCD = B * h

240 = 8 * AD

or AD = 240/8 = 30 cm

now ,

CD = AB = 12 cm (opp. sides of a IIgm)

AD = BC = 30 cm(opp. sides of a IIgm)

now ,

Perimeter of IIgm ABCD =

2a + 2b

or 2(a+b)

2 (30+12)

2(42)

or, 42*2 = 84 cm

QUESTION: 4

PQRS is a trapezium in which PQ = 7 cm, PS = QR = 5 cm, RS = x cm and distance between PQ and RS is 4 cm. The area of trapezium is

Solution:

QUESTION: 5

A triangle and a rhombus are on the same base and between the same parallels. Then the ratio of area of triangle to that rhombus is:

Solution:

If a triangle and a rhombus are on the same base and between the same parallels then the ratio of the areas of the triangle and rhombus is 1 : 2

The base of triangle and rhombus are equal. The rhombus have equal sides, and one side is the base of triangle.

The are of triangle must be half of the are of rhombus.

QUESTION: 6

ABCD is a parallelogram of area 100 cm^{2}. AE is drawn perpendicular to BC and AF is drawn perpendicular to DC. If AE = 8 cm and AF is equal to 6.25 cm, then AB is

Solution:

Area = B x H

100 = DC x AF

100 = DC x 6.25

DC = 100/6.25

DC = 16cm

AB = DC( in aparallelogram opposite sides are equal )

So AB = 16cm

QUESTION: 7

Parallelogram ABCD and rectangle ABEF are on the same base AB. If AB = 14 cm, BC = 12 cm, then the possible value for the perimeter of ABEF is

Solution:

IIgm ABCD and rectangle ABEF are between the same parallels AB and CF.

AB = EF (For rectangle) and AB = CD (For parallelogram)

? CD = EF ? AB + CD = AB + EF ... (1)

Of all the line segments that can be drawn to a given line from a point not lying on it, the perpendicular line segment is the shortest.

? AF < AD

similarly we write , BE < BC ? AF + BE < AD + BC ... (2)

From equations (1) and (2), we get

AB + EF + AF + BE < AD + BC + AB + CD

Perimeter of rectangle ABEF < Perimeter of parallelogram ABCD

Now, Perimeter of parallelogram ABCD = AB + BC + CD + DA = 14 + 12 + 14 + 12 = 52

Thus, Perimeter of rectangle ABEF < 52 cm

QUESTION: 8

ABCD is a parallelogram, Area(DAB) =

Solution:

ABCD is a parallelogram

In a Triangle ABC and ADC

AB=CD(opposite lines of a parallelogram)

BC=AD(opposite lines of a parallelogram)

AC=AC(common)

Triangle ABC and ADC ( SSS Cong. rule)

ar(ABC) =ar(ADC)=1/2 ar (ABCD)

Hence proved.

QUESTION: 9

In the following figure, if ED = 10 cm, BG = 8 cm and BE = CD = 9 cm, then find the area of triangle CDF.

Solution:

If a triangle and a parallelogram are on the same base and between the same parallels, then the area of the triangle is equal to half the area of the parallelogram.

Here, the area of the parallelogram = base x height = 10 x 8 = 80 cm^{2}

Therefore, the area of the triangle = 1/2 x area of parallelogram

= 1/2 x 80 = 40 cm^{2}

QUESTION: 10

Find the area of quadrilateral ABCD, if AB || CD and AB = CD is as shown in figure :

Solution:

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