The length of side PS according to the quadrilateral descriptions is; 21.
What is the length of side PS?
Since, it follows from the task content that the two quadrilaterals given are congruent, hence, the corresponding sides are congruent and are in proportion to each other.
On this note, we have;
x/35 = 15/25
x = (35×15)/25
x = 21.
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