two angles that have the same angle measure
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Statement Reason1. triangle ABC is equilateral..............................................given2. AC is congruent to BC;AB is congruent to AC........................................definition of equilateral3. angle A is congruent to angle B;and B is congruent to angle C.............................Isosceles Theorem4. angle A is congruent to angle C..................Transitive Property of Congruence5. triangle ABC is equiangular...............................Definition of equiangular
if two angles are supplements of the same angle (or of congruent angles), then the two angles are congruent.
Only if the congruent angle is the angle between the two congruent sides (SAS postulate).
No, because they need not be congruent.
If the parallelogram is a square then angle A is congruent to angle B ,is congruent to angle C. AB is congruent to BC is congruent to CD.