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skala 1 : 200
tinggi pada gambar
8 m dibagi skala
800 cm / 200 = 4 cm
luas sebenarnya
alas * tinggi / 2
10 * 8 / 2 = 40 m^2 = 400000 cm^2
luas gambar
5 * 4 / 2 = 10 cm^2
10 : 400000 = 1 : 40000