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B
4.5 cm
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C
6.5 cm
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D
5.5 cm
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Solution
The correct option is D5.5 cm In △DEF and △CEG ∠DEF=∠CEG (Common angle) ∠EDF=∠ECG (Corresponding angles) ∠EFD=∠EGC (Corresponding angles) Thus, △DEF∼△CEG (AAA rule) Thus, DECE=DFCG ⇒12=DF11 ⇒DF=5.5 cm