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ΔATP = Δ siku-siku di P
Limas beraturan = Rusuk tegaknya sama
bagusnya di gambar -_-
CP = TP
½ CT
= ½ 12√2
= 6√2 = TP
Karena ΔATP siku-siku, maka berlaku:
AP² = AT² - TP²
AP² = (12√2)² - (6√2)²
AP² = 288 - 72
AP² = 216
AP = √216
AP = 6√6