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= 2( 5x3 + 4x3)
= 2 ( 15 + 12)
= 2( 27)
= 54m²
Lpintu = p x l
= 0,9 x 2
= 1,8m²
Ljendela = 2 ( pxl ) <---ada 2jendela
= 2 ( 1,5 x 1,5)
= 2 ( 2,25)
= 4,5m
luas batu bata = 54 - 1,8 - 4,5
= 47,7m²
B.bata = 47,7 x 70
= 3.339 buah
jawabannya adalah 3.339 buah batu bata yang di butuhkan