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Penjelasan dengan langkah-langkah:
busur DC = 8,7 cm
luas juringDOC = 36 cm²
sudutDOC = 60⁰
36 = 60/360 ×πr²
36 = 1/6 × 3,14 × r²
r = 8,3 cm
keliling lingkaran = 2πr
= 2×3,14×8,3
= 52,1 cm
busur BC = 30/360× keliling
= 1/12 × 52,1
= 4,3 cm
busur AB =90/360 × keliling
= 1/4 ×52,1
= 13 cm
luas lingkaran = πr²
= 3,14 × 8,3²
= 216,3 cm²
luas AOC = (90+30)/360 × luas
= 1/3 × 216,3
= 72,1 cm²
