If ap bisects angle bac and m is any point on ap prove perpendicular drawn from m to ab and ac are equal
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let the perpendicular drawn on ab and ac be my and mz .
In triangle AYM and AZM :ASA congurency . Using c.p.c.t MY =MZ
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From M , drawn ML such that ML is perpendicular to AB and MN perpendicular to AC
In ΔLAM and ΔMAN [AP is the bisector of ∠BAC]
ΔALM and ΔANM=90⁰ [ML⊥AB,MN⊥AC]
AM=AM [ common ]
By Angle - Angle - Side criterion of congruence ,
ΔALM≅ΔANM
The corresponding parts of the congruent triangles are congruent
ML=MN [c.p.c.t ]
Henced proved✅
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