Dimensional changes

Question

If the dimensions of rectangle ABCD are tripled, the perimeter will be multiplied by ____ and the area will be multiplied by _____

Answer 1

P = 2(L+W)

triple L and W gives

2(3L+3W) = 6(L+W) = 3P, triple the dimensions, triples the perimeter

A=LW

triple L and W gives 3L(3W) = 9LW = 9A

triple the dimensions makes the area 3^2 or 9 times as large