1.

Internal bisector of an angle angle Aof 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 DABC then

Answer»

AE is H.M. of b and c
`AD = (2BC)/(b+c) cos (A//2)`
`EF = (4BC)/(b+c) sin (A//2)`
The triangle AEF is isosceles

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


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