| Term | Definition |
|---|
| isosceles triangle | a triangle that has at least two congruent sides |
| vertex angle | the angle between the two sides of equal length |
| base | the side opposite the vertex angle |
| legs | the two congruent sides |
| base angles | the two angles opposite the two sides of equal length |
| exterior angle | the angle formed when extending one side of a triangle beyond its vertex |
| adjacent interior angle | the angle in a triangle that shares a vertex with the exterior angle |
| pair of remote interior angles | the two angles in a triangle that do not share a vertex with the exterior angle |
| included angle | and angle included between two sides of a triangle |
| included side | a side included between two sides of a triangle |
| CPCTC | Corresponding Parts of Congruent Triangles are Congruent |
| paragraph proof | a logical argument presented in paragraph form |
| flowchart proof | a logical argument presented in flowchart form |
| congruence shortcuts | SSS, SAS, ASA, SAA |
| not congruence shortcuts | SSA, AAA, non-corresponding parts |
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