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Ditanya : Luas lingkaran = ....?
Luas lingkaran = 1/2πd²
= 1/2 × 22/7 × 21²
= 1/2 × 22/7 × 441,, 441 dan 7 disederhanakan dengan 7 menjadi:
= 1/2 × 22 × 63
= 1/2 × 1.386
= 693 cm²