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= 10² - 6²
= 100 - 36
= 64
BC = 8 cm = AB
Luas APCB = Luas APCB
2. (1/2) . BC . PC = (1/2) . PB . AC
8 . 6 = (1/2) . 10 . AC
48 = 5 . AC
AC = 9,6 cm