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luas= 4 x π x r²
= 4 x 3,15 x 5 x 5
= 3,14 x 100
= 314 cm²
r = 1/2 × 10 cm = 5 cm
L bola = 4πr²
= 4 × 3,14 × 5² cm²
= 314 cm²