(1) Proof: Because OB=OC
So OBC angle = OCB angle.
And because the angle BEC= angle CDB (right angle), BC=CB.
So triangle CDB and triangle BEC are congruent.
So angle DBC= angle ECB
So AB=AC
So triangle ABC is an isosceles triangle
(2) in
The bisector of the proof angle BAC passes through BC to D.
Because AB=AC
So AD divided BC vertically (three lines in one).
Connecting outer diameter
Because d is the midpoint between BC and OB=OC.
So OD vertically divides BC (three lines in one)
And because BC was divided vertically in AD.
So the three-point * * * line of OAD
So o is on the bisector of the angle BAC.