Question

Polygons ABCD and EFGH are similar. What is the perimeter of ABCD?

Answer 1

Here is the diagram

Answer 2

EFGH looks to be 10/8 times larger... or scaling factor = 10/8

so take AD and multiply it by 10/8

then find the larger polygon.

then find the reciprocal of the scaling factor and then multiply it by the perimeter of the larger polygon to find the perimeter of the smaller...

hope it helps.

Answer 3

Someone told me that CD = 4, and that BA= 15 and EH= 12. I'm very very ignorant in this subject.

Answer 4

well that is the long method the scaling factor small to large is 10/8

so large to small is the reciprocal... 8/10

when you match corresponding sides...

so you can do the 3 calculations to get the side of the smaller polygon...

it works just as well... just extra work.

Answer 5

Answer is 36, I think.

Answer 6

that's correct

Answer 7

The way I did is the long way I guess. Thanks for your help!