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L = 1/2 (jmlah sisi sjajar) t
60 = 1/2 (3a+5a) t
60 = 1/2 . 8a . 15
60 = 60a
a = 60/60
= 1
sisi 1 = 3a = 3.1 = 3 cm
sisi 2 = 5a = 5. 1 = 5 cm