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= 3/4 . 3,14 . 15 . 15
= 3/4 . 706,5
=529,875cm2
Luas = 3/4πr²
= 3/4 x 3,14 x 15²
=3/4 x 3,14 x225
=3/4 x 706,5
=529,875 cm²