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L = a x t
162 = a x 2 x a
162 = 2 x a kuadrat
162 : 2 = a kuadrat
81 = a kuadrat
a =√81
a = 9
t = 2 x a
= 2 x 9
= 18
jadi, alasnya adalah 9.sedangkang tingginua 18