Question

If the perimeter of a rectangle is 200m and iits breadth is 40m, then its area in sq. metre will be
a. 1600
b. 2400
c. 2800
d. 3600

Answer 1

2 (l+b) = 200
2 (l+40) = 200
2l + 80 = 200
2l = 200-80 = 120
l = 60

area = l × b
= 60×40
= 2400 sq. m

answer = b) 2400

Answer 2

Answer:

b. 2400

Explanation:

We are given that the perimeter of the rectangle is 200 m and that its breadth is 40 m

We start by getting the length as follows:

Perimeter = 2(length + breadth)

200 = 2(length + 40)

100 = length + 40

length = 100 - 40 = 60 m

Now, we can get the area as follows:

Area of rectangle = length * breadth

Area of rectangle = 60 * 40 = 2400 m²

Hope this helps :)