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caranya = rumus permukaan tabung . 150
rumus permukaan bola
= 2πr(r+2r) . 150
4πr²
= 2πr(3r) . 150
4πr²
= 2π.3r² . 150
4π.r²
= 3r² . 150
2r²
= 3 . 150
2
= 225