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L = p x l
= 90 cm x 7 cm
= 56 senti meter persegi
56 : 10000 = 0,0056 are
kenapa di bagi 10000 karena naik dua tingkat
l= 7 cm = 0,07 m
Luas = p . l = 0,9 . 0,07= 0,063 m^2
0,063 : 100 = 0,00063 are karena 1 are = 100 m^2