Question

Drew has a rectangular postcard that is 6
inches long and 4 inches wide. He uses a
photocopier to enlarge it, so that the length
and width are 1.5 times as long as those
of the original postcard. Explain how the
perimeter and area change.

Answer 1

FOR ALL SIMILAR GEOMETRIES:

all lengths including perimeter scale with the length scale so if you multiply lengths by 1.5 then you multiply perimeter by 1.5

Area is proportional to lengths squared so multiplying lengths by 1.5 multiplies areas by 2.25

Answer 2

1000