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A : B = a : b
maka
A = a/b x B
B = b/a x A
a = A/B x b
b = B/A x a
sehingga :
Lebar sebenarnya = lebar/tinggi x Tinggi sebenarnya
= 12/30 x 45
= 2/5 x 45
= 18 m
lebar model = 12cm
tinggi model = 30cm
tinggi rumah = 45m = 4500cm
dit :
lebar rumah = ?
jawab :
X/12 = 4500/30
30X = 54000
X = 54000/30
X = 1800cm = 18m