71. In a square PQRS, PQ = (5a - 17) cm and QR = (2a + 4). Find the length of PS and PR.
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Answer:
5a-17 = 2a +4 (sides of square)
5a - 2a = 4 + 17
3a = 21
a = 7
side PQ = 5(7) - 17
= 35- 17
=18 cm
since, PQRS is square
therefore , PQ = QR = RS = SP
PS =PR= 18 cm
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