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In the given figure lfloorBAC=90^(@). ...

In the given figure `lfloorBAC=90^(@)`.
Prove that :

a] `DeltaAGF~DeltaBDG`
b] `DeltaAGF~DeltaEFC`
c] `DeltaBDG~DeltaEFC`
d] `DE^(2)=BDxxEC`

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