Question

Diagonal of rectangle is 15cm and length is 12cm so what is the perameter of rectangle

Answer 1

In rect. each angle is 90 degree.

So, diagonal ^2 = length ^2 +Breadth^2.

15 ^2 = 12^ + x^2

225 - 144 =x^2

x^2 = 81

x= 9 = breadth of the rectangle.

Now perimeter of rectangle = 2(length + breadth).

P = 2( 12 + 9)

P = 2 ☓ 21

P = 42cm

Hence perimeter of rectangle is 42 cm.