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Luas segitiga ABC = 1/2.21.28
= 294 cm²
jari - jari lingkaran luar :
r = (a.b.c) / 4 x luas egitiga ABC
= (21.28.35) / 4 . 294
= 17,5 cm
Keliling lingkaran luar:
K = 2πr
= 2 . 3,14 . 17,5
= 109,9 cm
= 110 cm (jawaban D)