Question

Find the area of a quadrilateral ABCD in which AD =
DA= 5 cm and AC= 5 cm.
Radha made a picture of an aeroplane with coloured paper as shown in Fig 12.15. Find
the total area of the paper used.
15cm
6.5cm
11
Tom
Tom
2cm
Fig. 12.15​

Answer 1

The total area of the paper used will be the sum of the area of the sections I, II, III, IV, and V. i.e.,

total area of 1 + 2 + 3 + 4 + 5

For section I:

a= 1 cm and B= c = 5 p.m.

Here, the sides are

So, the Semi-perimeter will be:

S=a+B+c/2

5+5+1/2

5.5

A= s(s-a)(s-b)(s-c)

5.5(5.5-1) (5.5-5) (5.5-1)

6.1875