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luas juring = 90/360 * πr²
= 1/4 * 3,14 * 6²
= 28,27 cm²
luas segitiga = 1/2 * a * t
= 1/2 * 6 * 6
= 18 cm²
Luas tembereng = 28,27 - 18
= 10,27 cm²