29. If the sides of a parallelogram are increased to twice its original lengths, how much will the perimeter of the new parallelogram be?
(a) 1.5 times
(b) 2 times
(c) 3 times
(d) 4 times
Perimeter of parallelogram = 2(l + b).
If each side is doubled: new perimeter = 2(2l + 2b) = 2 × 2(l+b).
So perimeter doubles.