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luas 1/2 lingkaran
= 1/2 × π r kuadrat
= 1/2 × 3,14 × 10 × 10
= 1/2 × 314
= 157 cm2
luas layang-layang
= 1/2 × d1 × d2
= 1/2 × 21 × 12
= 1/2 × 252
= 126 cm2
luas diarsir
157 cm2 + 126 cm2 = 283 cm2