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Verified answer
D = 14 m => r = 7 mLuas 1/2 bola = 1/2 . 4πr²
= 2πr²
= 2 . 22/7 . 7²
= 2 . 22 . 7
= 308 m²
Biaya untuk mengecat = 308 x Rp90.000,00
= Rp27.720.000,00