+1495 Help Me, 
please!
Given: AB=AC, angle1=angle2
Prove: angle B= angle C
+128406 AB = AC given
Angle 1 = Angle 2 given
Angle BAD is supplemental to Angle 1 supplementary pair
Angle CAD is supplemental to Angle 2 supplementary pair
Angle BAD + Angle 1 = 180 definition of supplemental
Angle CAD + Angle 2 = 180 definition of supplemental
Angle BAD + Angle 1 = Angle CAD + Angle 2 substitution
Angle BAD = Angle CAD subtraction property of equality
AD = AD reflexive property of equality
Triangle DAB congruent to Triangle DAC SAS
Angle B = Angle C corresponding parts of congruent triangles are congruent
