[2n Delta ABC,quad /_B=2/_C,O/S],[" point on "BC" such thet "AD],[" brects "/_A" and "A theta=CD" ."],[" Prow "/_BAC=72:]

ABC is a triangle in which /_B=2/_CD is a point on BC such that AD bisects /_BAC and AB=CD. Prove that /_BAC=72^(0) .

ABC is a triangle in which /_B=2/_C*D is a point on BC such that AD bisects /_BAC and AB=CD. Prove that /_BAC=72^(@) .

In triangle ABC, angle B is equal to twice of angle C,D is a point on BC such that AD bisects /_BAC and AB=AD .Prove that /_BAC=72^(@)

In Delta ABC, If AD _|_ BC, then AB^2 + CD^2 is equal to

In Delta ABC, if /_C=(/_A+/_B)/(2) then,find /_C

In DeltaABC, AD bot BC , point D lies on BC. If AC^(2)=CD*BD , prove that /_BAC is a right angle.

In Delta ABC , C is a point on BD such that BC:CD=1:2 and △ABC is an equilateral triangle Prove that AD^(2) = 7AC^(2)