Question

The sides of a rectangle are in the ratio of 3:5 .find the sides if the perimeter of the rectangle is 80 cm.

Answer 1

let the sides=

3x

5x

2 (3x+5x)= 80

6x+10x= 80

16x= 80

x= 5

so,

measure of sides of rectangle are


3×5= 15cm

5×5= 25cm

Answer 2

Given: The sides of the rectangle are in the ratio 3:5 and the perimeter is 80 cm.

To find: The sides.

Answer:

Let the sides be 3x and 5x.

Formula to find the perimeter of a rectangle: 2(Length + Breadth)

Substituting the respective values in the above formula,

80 = 2(3x + 5x)

80 = 2(8x)

80/2 = 8x

40 = 8x

x = 40/8

x = 5

Therefore, the sides are 3x = 3*5 = 15 cm and 5x = 5*5 = 25 cm.

Hope it helps :)