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540=15 s²
s²=36
maka s=√36=6 cm
180 = 1/3 l.alas x 15
l.alas = 180 / 5
l. alas = 36
karena, alasnya berbentuk persegi maka:
l. alas = s x s
36 = s (kuadrat)
s = akar dari 36
s = 6