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L segitiga = 1/2 . 24 . 10 = 120
s = (24 + 26 + 10) / 2 = 30
a. r = L / s = 120 / 30 = 4 cm
b. r = abc / 4L = 24 . 26 . 10 / 4 . 120
= 13 cm