The perimeter of a square is 80 units. Find its perimeter when the length of its side is doubled.
Perimeter of a square of side a units = 4a units
Given that 4a = 80
Given that side is doubled,
⇒ 2a=2×20=40 units
New perimeter = 4×2a=4×40=160 units.
The perimeter of a square is 60 cm. Find its side-length.
Perimeter of a square plot with side 2x is 40 units. Find the length of its side.