Question

The area of rectangle is 105cm².If it length is 21 cm,what is its length and perimeter.​

Answer 1

length 5cm and perimeter 52 cm

Explanation:

length=area/breadth

=105/21

=5 cm

perimeter=2(length+breadth)

=2(5+21)

=52 cm

Answer 2

length of other side is 5cm and the perimeter is 52

Explanation:

The area is side x times side y.

Knowing that the area A is 105cm2 and side x is 21cm

A= x*y

105cm2= 21 y /21

Arranging for y we get

y= 105/21

y= 5 cm

The perimeter is all sides added up

P= 21+21+5+5=52cm