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AC2 = 12 × 12 + 9 × 9
AC2 = 144 + 81
AC2 = 225
AC = 15 cm
S = 15/12
S = 5/4
Panjang AD
AD = S × AC
AD = 5/4 × 15
AD = 75/4
AD = 18,75 cm
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