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= 20 - 6
= 14 cm
K 1/2 lingkaran = phi . d . 1/2
= 22/7 . 14 . 1/2
= 22 cm
K segitiga = ab + bc +ca
= 24 + 24 + 20
= 68 cm
K diarsir = K segitiga - K 1/2 lingkaran
= 68 - 22
= 46 cm