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sisi: 14 x 2 = 28 x 2 = 56 x 56 = 3.136 cm²
luas AC:
r = 14 x 2 = 28 cm
22/7 x 28 x 28 = 2.464 cm²
luas BC:
r = 14 x 2 = 28 x 2 = 56 - 14 = 42 (diameter) : 2 = 21 cm
22/7 x 21 x 21 = 1.386 cm²
luas AB:
r = 14 : 2 = 7
22/7 x 7 x 7 = 154 cm²
luas daerah yang diarsir:
2.464 - 1386 = 1.078 + 154 = 1.232 cm²
3.136 - 1.232 = 1.904 cm²
maaf kalau ada yang salah :)