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= 3,14 x 20 cm
= 62,8 cm
Luas : π × r × r
= 3,14 × 10 cm × 10 cm
= 314 cm²
2. Keliling : π × d
= 22/7 × 14 cm
= 44 cm
Luas : π × r × r
= 22/7 × 7 × 7
=154 cm²
Maaf kalau salah...