The side of a square is 10cm. How many times will the new perimeter become if the side of the square is doubled?

Given:

Length of side = 10 cm.

Perimeter of Square, P₁ = 10 × 4

= 40 cm

If the side is doubled, so new side = 20 cm

So new perimeter, P₂ = 20 × 4

= 80 cm

So it is clearly seen that the new perimeter is twice that of the old perimeter.

So correct answer is A [two times].