Question

in the adjoining figure AB=AC and AD is bisector. The rule by which ∆ABD = ∆ACD​

Answer 1

in ∆ABD and ∆ACD

AB= AC

it means ABC is isoceles triangle

by property of isoceles triangle

/ABD=/ACD

and AD bisects the BC so

BD= DC

by SAS congruency rule

∆ABD = ∆ACD

hence proved