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Question

In figure, line segment DF intersects the side AC of a ΔABC at the point E such that E is the mid – point of CA and AEF and AFE. Prove that BDCD=BFCE


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Solution

Given, ΔABC, E is the mid-point of CA and AEF=AFE
To prove BDCD=BFCE
Construction Take a point G on AB such that CG II EF.
Proof Since, E is the mid – point of CA.
CE = AE ………(i)
In ΔACG, CG II EF and E is mid – point of CA.
So, CE = GF ……(ii)
[ by mid-point theoreum]
Now, in ΔBCG, and ΔBDF, CG II EF
BCCD=BGGF [by basic proportionally therorem]
BCCD=BFGFGFBCCD=BFGF1
BCCD+1=BFCE [from Eq.(ii)]
BC+CDCD=BFCEBDCD=BFCE


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