Diketahui persegi panjang ABCD dan P merupakan titik di dalam persegi panjang. Jika PC=8cm, PD= 4cm, dan PB=7cm, maka PA adalah ...
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Jawab8² = b² + c²
4² = a² + c²
7² = b² + d²
AP² = a² + d²
AP² = a² +c² + b² - b² - c² + d²
AP² = (a²+c²) - (b² + c²) + (b² + d²)
AP² = 4² - (8²) + (7²)
AP² = 16 - 64 + 49
AP² = 1
AP = 1