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luas segitiga=alas x tinggi :2
luas segitiga=10 x 12(13 kuadrat-5kuadrat =169-25=144 diakar) : 2=60
36 = 2s +10
2s = 26
s= 13
t^2 = 13^2 - 5^2
t = 12
l = a x t /2
= 10 x 12 /2
=60