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alas = 15
tinggi = ?
tinggi = √17² - 15²
= √289 - 225
= √64
= 8 cm
luas segitiga = 1/2 x a x t
= 1/2 x 15 x 8
= 60 cm²
luas = 1/2 x a x t = 1/2 x 15 x 8 = 1/2 x 120 = 60 cm²