Question

Findthe area of a rectangle whose perimeter is 240m and breadth is 42 m​

Answer 1

Answer:

Step-by-step explanation:

perimeter given is 240 m

perimeter of rectangle= 2(l+b)

breadth given=42m

atq

2(l+b)=240m

2(42+l)=240m

84+2l=240

l+84=240/2=120

l+84=120

l=120-84

l=36

Answer 2

Answer:

78

Step-by-step explanation:

in this question the breadth and perimeter is given, then we have to find the length of the particular rectangle.

                         perimeter of rectangle= 2(length+breadth) unit

so let the length be x

then, 2(42+x)= 240

84+2x= 240     as 84 will towards right  side then it would change the sign.

2x= 156            as 2 will towards right  side then it would change the sign.

x= 156/2

x= 78

hence i prooved my answer!!!!