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bentuk atap = jajar genjang
Luas jajar genjang = p x l
= 4 x 12
= 48 m persegi
b. berapa banyak genting yang diperlukan?
jumlah genting per m2 = 20 buah
total genting yang dibutuhkan = 48 x 20
= 96 buah genting
semoga membantu :)