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= Luas segitiga - Luas lingkaran
= ( ½ x 30 x 60 ) - ( 22/7 x 10,5 x 10,5 )
= 900 cm² - 346,5 cm²
= 553,5 cm²
9) Luas yang diarsir
= Luas persegi - Luas ½ lingkaran
= ( 16 x 16 ) - ( ½ x 3,14 x 8 x 8 )
= 256 cm² - 100,48 cm²
= 155,52 cm²