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12x = 180
x = 15
<A = 3x = 3 x 15 = 45
8. L = a.t/2
60 = 10.t/2
60 = 5t
t = 12
kalo pake phytagotas 5, 12, 13
jadi keliling = 13 + 13 + 10 = 36