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a² = + (c-x)²
a² = b² - x² + (c-x)² ⇒ = b² - x²
a² = b² - x² + c² - 2cx + x²
a² = b² + c² - 2cx
2cx = b² + c² - a²
lanjutannya ada pada gambar, smoga membantu.