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= 3, 14 × 15²
= 706,5 cm²
keliling lingkaran = π×d
= 3, 14 × 30
= 94,2 cm
Luas = 1/4 πd² = 1/4 x 3,14 x 30²
= 1/4 x 2826
= 706,5 cm ²