ABCD is a parallelogram and E is a point on BC. if the diagonal BD intersects AE at F, prove that AF x FB = EF x FD.
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Given: ABCD is a parallelogram and E is a point on BC. The diagonal BD intersects AE at F.
To prove :- AF x FB = EF x FD.
Proof:- Since ABCD is a paralellogram, then its opposite sides must be parallel.
∴ In Δ ADF and Δ EBF
∠FDA=∠EBF and ∠FAD=∠FEB [Alternate interior angles]
∠AFD=∠BFE [vertically opposite angles]
∴ By AAA similarity rule
Δ ADF ≈ Δ EBF
Also, the correspondingsides of similar triangles are proportional.
∴
Hence proved.
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