Question

In Fig. 20.38, a parallelogram is drawn in a trapezium, the area of the parallelogram is 80 cm², find the area of the trapezium.

Answer 1

The given figure is:

From above figure, it is clear that the length of the parallel sides of the trapezium are 22 cm and 10 cm.

Also, it is given that the area of the parallelogram is 80 cm² and its base is 10 cm.

We know:

Area of parallelogram=Base x Height

∴ 80 = 10 x Height

\[\text{ Height }=\frac{80}{10}= 8 cm\]

So, now we have the distance between the parallel sides of trapezium, which is equal to 8 cm.

\[ \therefore\text{ Area of trapezium }=\frac{1}{2}\times(\text{ Sum of the parallel sides })\times(\text{ Distance between the parallel sides })\]

\[ = \frac{1}{2}\times(22+10)\times(8)\]

\[ {=128 cm}^2\]