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p = 18 x 200
p = 3600 cm
p = 36 m
Lebar sebenarnya adalah:
l = 24 x 200
l = 4800 cm
l = 48 m
Jadi, luas sebenarnya adalah:
L = p x l
L = 36 x 48
L = 1728 m²
1:200 = 432 :js
js = 432 ; 0,005
js = 86400 cm'2