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CA² = 256 - 144
CA² = 112
L lingkaran = 1/4 π d² ----> d² = CA²
= 1/4 . 22/7 . 112
= 22/7 . 28
= 88
L segitiga = 1/2 . a . t
= 1/2 . 12 . √112
= 6√112
= 6 . 10,6
= 60,6
L yang diarsir = 88 - 60,6
= 27,4