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Verified answer
Mapel : MatematikaBab : Kesebangunan dan Kekongruenan
AB / DE = BC / CD
12 cm / 8 cm = CD + 3 cm / CD
12 cm x CD = 8 cm ( CD + 3 cm )
12CD = 8CD + 24
12CD - 8CD = 24
4CD = 24
CD = 24/4
CD = 6 cm