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= 21²
= 441 cm²
Luas segitiga
= 21 . 21 : 2
= 441 : 2
= 220,5 cm²
Luas ½ lingkaran
= 22/7 . 10,5² . ½
= 346,5 : 2
= 173,25 cm²
Luas lempeng baja
= L persegi + L segitiga - L ½ lingkaran
= 441 + 220,5 - 173,25
= A. 488,25 cm²
Opsi A
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