1. rumus lingkaran = π×r²
= 22/7 × 14 × 14
= 22 × 2 × 14
= 616cm
2. rumus keliling lingkaran = 2πr
= 2 × 3,14 × 40
= 251,2cm
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1. rumus lingkaran = π×r²
= 22/7 × 14 × 14
= 22 × 2 × 14
= 616cm
2. rumus keliling lingkaran = 2πr
= 2 × 3,14 × 40
= 251,2cm