Answer:
10.
Explanation:
As the figures are similar corresponding sides ( including the perimetrers) are in the same ratio, so:
2.5/5 = P/20 where P is the perimeter of EFGH.
5P = 20*2.5
P = (20*2.5)/5
= 50/5
= 10.
10
The lines B-C and F-G show us the scale factor is 1/2. Therefore, you halve all the values of FGEH to get: 2.5+2+4+1.5=10, or half of the original shapes perimeter, 20.
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