Question

The sides of a rectangular field are in the ratio of 4:5. If the area is 80 sq.cm. Find the length of its sides.

Answer 1

Let the sides be 4x and 5x
Area of rectangle =80cm²
4x*5x=80cm²
20x²=80
X²=80/20=4
X²=4
X=2

Lenght of sides =4*2=8, 5*2=10
Sides =8 and 10cm

Answer 2

Given,
Area=80 cm²
Ratio of its sides=4:5
Let the b of the rectangle be 4x and l be 5x
A/Q
4x*5x=80
=20x²=80
=x²=80/20
=x²=4
=x=√4
=2
Therefore,length of its sides=4*2 and 5*2
=8cm and 10cm