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BD² = 13² - x²
= 15² - (14 - x)²
atau
169 - x² = 225 - (196 - 28x + x²)
169 - x² = 225 - 196 + 28x - x²
28x²= 140
x² = 5
Jadi :
BD² = 169 - x²
= 169 - 5
= 164
BD = 2√41
Jadi panjang garis tinggi dari titik sudut B adalah 2√41 cm