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a = 12 cm
b = 16 cm
maka dgn tripel Pythagoras
c = 20 cm
Luas segitiga = 1/2 x 12 x 16 = 96 cm²
utk mencari luas lingkaran cari jari2 lingkaran dalam dahulu
s = 1/2 keliling segitiga
= 1/2 (12+16+20)
= 1/2 (48)
= 24
panjang jari2 lingkaran dalam:
r = Luas segitiga/s
r = 96/24
r = 4 cm
Luas lingkaran = πr²
= 3,14 x 4 x 4
= 50,24 cm²
luas arsiran = luas segitiga - luas lingkaran
= 96 - 50,24
= 45,76 cm²
semoga membantu ya :)