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skala = 1 : 450
ukuran pd denh = 7,5 cm x 20 cm
maka :
ukuran sebenarnya :
lebar = 7,5 x 450 = 3.375 cm = 33,75 m
panjang = 20 x 450 = 9.000 cm = 90 m
jdi :
L = 90 x 33,75
= 3.037, 5 m²