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### Triangle Sum Theorem

The theorem that states that the measures of the angles in a triangle add up to 180 degrees.

### 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

### SAS

Two triangles are congruent if 2 sets of corresponding sides and their included angles are congruent.

### AAS

Two triangles are congruent if 2 sets of corresponding angles and one set on non-included sides are congruent.

### ASA

Two triangles are congruent if 2 sets of corresponding angles and their included side are congruent.

### CPCTC

If you use a congruence shortcut, (SSS,SAS,ASA,AAS) to show that 2 triangles are congruent, then you can use this to show that any of their corresponding parts are congruent

### Base Angles Theorem

if two sides of a triangle are congruent, then the angles opposite them are congruent

### Converse of the Base Angles Theorem

If two angles of a triangle are congruent, then the sides opposite them are congruent.

### Flickr Creative Commons Images

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