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### Third Angle Theorem

If 2 angles of 1 triangle are congruent to 2 angles of a second triangle then the third angles of the triangles are congruent

### Exterior Angle Theorem

measure of the exterior angle is equal to the sum of the remote interior angles

### SSS Postulate

if three sides of one triangle are congruent to three sides of a second, the triangles are congruent

### ASA Postulate

if two angles and the included side of one triangle are congruent to two angles and the included side of the second, the triangles are congruent

### AAS Theorem

if two angles and a non-included side of one triangle are congruent to the corresponding parts of another triangle, then the triangles are congruent

### SAS Theorem

If two sides and the included angle of one triangle are equal to two sides and the included angle of another triangle, then the triangles are congruent

### Isosceles Triangle Theorem

if 2 sides of a triangle are congruent, then the angles opposite those sides are congruent