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jwb:
1:450:750cm
450×750:337500:100:3375
:1:450:20cm:450×20:90000:100:900
3375+900:4275
lebar sebenarnya = 20 x 450 = 9.000 cm = 90 meter
luas = p x l
= 33,75 x 90
= 3.037,5 m²
semoga membantu ya :)