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36 = x + 6 + x + 3 + x
36 = 3x + 9
x = 9
(alas = 9 : tinggi = 12 : sisi miring = 15)
luas segitiga = 1/2 a x t
luas segitiga = 1/2 (9) x 12
luas segitiga = 54
3x + 9= 36
x = 27/3 = 9
luas = 1/2 A x T = 1/2x9 x 12 = 54