Question

In the given figure, DC = 12 cm and EF 7cm.
Find: i) Area of rectangle ABCD
ii) Area of A EDC
iii) Area of shaded green portion​

Answer 1

The area of the rectangle ABCD is 12×7=84

Answer 2

Answer:

(i) 84cm²

(ii) 42cm²

(iii) 42cm²

Step-by-step explanation:

(i) Area of rectangle ABCD:-

Area of rectangle = length x breadth

In this case

length: 12cm

breadth: 7cm

Thus, area = 12 x 7

=> 84cm²

(ii) Area of A EDC:-

Area of triangle = 1/2 x base x height

In this case

base: 12cm

height: 7cm

Thus, area = 1/2 x 12 x 7

=> 42cm²

(iii) Area of shaded green portion​:-

It is clearly visible in this figure that

Area of shaded region + Area of triangle EDC = Area of rectangle ABCD

Thus of shaded region = Area of rectange ABCD - Area of triangle EDC

=> 84 - 42 ... [from (i) and (ii)]

=> 42cm²