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6/9 = X/ X + 4
6(X + 4) = 9 . X
6X + 24 = 9X
24 = 9X - 6X
24 = 3X
X = 24 : 3
X = 8
AC = X + 4
= 8 + 4
AC = 12 cm
x itu maksudnya panjang sisi CD ya...
semoga membantu
6/9=CD/CD+4
2/3+CD/CD+4
2CD+8=3CD
8=CD
AC=CD+AD
= 8+4
=12cm