1.

Internal bisector of /_A of triangle ABC meets side BC at D.A. line drawn through D perpendicular to AD intersects the side AC at E and the side AB at F. If a, b, c represent the sides of DeltaABC, then :

Answer»

Ae is H.M. Between B and C
`AD=(2bc)/(b+c)cos.(A)/(2)`
`AF=(4bc)/(b+c)sin.(A)/(2)`
the TRIANGLE AEF is isosceles

Answer :A::B::C::D


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