Answer:
x = 20
Explanation:
Since the polygons are similar then the ratios of corresponding sides are equal, that is
= ( cross- multiply )
5x = 100 ( divide both sides by 5 )
Answer is 20.
Since they are similar thus ratio of sides would be equal the top side is double of the first polygon. so the side x wud be double of 10. which is 20
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= 
( cross- multiply )