Question

Class 7 maths. Pls tell fast but correct. ​

Answer 1

Step-by-step explanation:

Let the breadth of ABCD be xcm. Then,

2(12+x)=40

24+2x=40

2x=16

x=16

Length and breadth of MNOP= 12cm and 16cm respectively.

I hope this answer will help you..

Answer 2

Explanation

The length of rectangle ABCD =12m, breadth = x and perimeter =40m

So the perimeter of the rectangle is 2(l+b)

=2(12*x)=40

=24+2x=40

=2x=40-24

=2x=16

=X=16/2(divisible by 2)

=x=8

Breadth =x=8

So,the length and breadth of a rectangle MNOP is 12 and 8 respectively

Check:

2(12+8)=40

2*20=40

40=40

LHS = RHS

I hope this helps you ..