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= 1/2.30.15 = 15 . 15 = 225 cm²
luas 1/2 lingkaran = 1/2 . phi . r²
=1/2 . 3,14 . 10 . 10
= 157 cm²
jml = 225+157 = 382 cm²
semoga membantu, maaf klo salah