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PQ = 72/360 x 2 x r x pi = 35
         = 1/5 x 2 x pi x r = 35
2 x pi x r = 35: 1/5 = 175................... (kelilingnya)

QOR = 180 - 72 = 108

QR = 108/360 x 2 x pi x r
      = 3/10 x 175
      = 52,5 cm