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15² = 17² - (rq - 2)²
225 = 289 - (rq-2)²
(rq-2)² = 289 - 225
(rq-2)² = 64
rq-2 = 8
rq = 8 + 2
rq = 10
jadi, panjang jari-jari Q adalah 10cm
#cmiiw