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Alas = 4/5 X
x * 4/5x = 180
4/5 x² = 180
x² = 225
x = 25
- 5*x = tinggi
90 = 4x*5x /2 = 20x² ÷ 2 = 10x²
90 = 10x²
90 ÷10 = x²
9 = x²
√9 = x
3 =x
Maka, tinggi segitiga = 5*x =5×3= 15cm