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36 = 2sm + 10
36 - 10 = 2sm
26 = 2sm
26/2 = sm
13 = sm
t^2 = sm^2 - 5^2 -----> 5 itu dari a = 10 dibagi 2
= 13^2 - 5^2
= 169 - 25
= 144
t = 12
L = 1/2 x a x t
= 1/2 x 10 x 12
= 60