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a = alas
t = 2a
L = a.t
162 = a.2a
2a² = 162
a² = 162/2 = 81
a = √81 = 9 cm
t = 2a = 2.9 = 18 cm
= 2x*x=162
2x^2=162
x^2= 162/2
x=akar 81
x=9
tinggi=2*9=18
alas=9