In Exercises 21 to 24,
Given: 

Find: 

To calculate:
The value of the side
Given:
It is given that
Definition Used:
Similarity between Two polygons:
Two polygons are similar if and only if when all pairs of corresponding angles are congruent and all pairs of corresponding sides are proportional.
SegmentAddition Postulate:
If
Calculation:
According to the definition of similar polygon,
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