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AB = 10 cm
AC = 24 cm
Ditanya:
r = ------------?
Jawab:
BC² = AB² + AC²
= 10² + 24²
BC = √676
= 26 cm
L ΔABC = 1/2 x 10 x 24
= 120 cm²
s = (10 + 24 + 26)/2 = 30 cm
r = L/s
= 120/30
= 4 cm
Jadi panjang jari-jari lingkaran dalam segitiga tersebut 4 cm (B)