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Sisi miring segitiga = 20cm
L. segitiga = 12x16/2 = 96cm²
KLL. Segitiga = 12 + 16 + 20 = 48cm
r = 2.L segitiga / KLL segitiga
r= 192 / 48 = 4cm
BC = √12² + 16²
BC = √144 + 256
BC = √400
BC = 20 cm
r dalam = LΔ/s
r dalam = 12 . 16 : 2 / 1/2 (12 + 16 + 20)
r dalam = 96 / 24
r dalam = 4 cm