Jawabanmu

2014-03-12T20:41:22+07:00
Pertama jadikan satuannya sama cm
p = 90 cm , l = 7 x 100 = 700 cm
sekarang di cari luasnya
p x l = 90 x 700 = 63.000 cm²
konvert ke are
63.000/1000000 = 0,063 a / dam²
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2014-03-12T20:46:09+07:00
Are = dam2 7 m = 700 cm L = p x l = 90 x 700 = 63000 cm2 = 0,063 are
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