Question

r

Answer 1

when polygons are similar, their sides are proportional, means the ratios of their sides are equal.

Answer 2

what are the sides of smaller pentagon ? what are the sides of larger pentagon ?
then just take their ratios and equate them.

Answer 3

i meant : 'when polygons are similar, their "corresponding" sides are proportional'

Answer 4

Corresponding sides of similar polygons with the same number of sides are in proportion.

So, you need to solve the proportion (think equation):

(x - 3)/ (2.5) = 8/2

Answer 5

yes. thats correct :)