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Kelas 8 MatematikaBab Lingkaran
Luas daerah yang dapat dibersihkan alat tersebut
= α/360° . π . (R² - r²)
= 120°/360° . 3,14 . ((15 + 10)² - 10²)
= 1/3 . 3,14 . (625 - 100)
= 1/3 . 3,14 . 525
= 449,5 cm²