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= p × l
= (7 × 3) × 10
= 21 × 10
= 210
Luas 1/2 lingkaran
= 1/2 × pi × r2 (r × r)
= 1/2 × 22/7 × 7 × 7
= 11 × 7
= 77
Luas gabungan = 210 + 77 = d.287 cm2