| A | B |
|---|
| Congruent triangles | If triangles are congruent, their is a correspondence between their angles and sides, such that corresponding angles are congruent and corresponding sides are congruent. |
| Equilateral triangle | Triangle with three congruent sides. |
| Isosceles triangle | Triangle that has at least two congruent sides. |
| Scalene triangle | Triangle that has no sides congruent. |
| Acute triangle | Triangle that has three acute angles. |
| Equiangular triangle | Triangle that has three congruent angles, each measure 60 degrees. |
| Right triangle | Triangle that has one right angle. |
| Obtuse triangle | Triangle that has at least one obtuse angle. |
| Legs of a right triangle | The sides adjacent to the right angle. |
| Legs of an isosceles triangle | The congruent sides of an isosceles triangle. |
| Hypotenuse | The side opposite the right angle. |
| Base | In an isosceles triangle with two congruent sides, the non congruent side. |
| CPCTC | Corresponding Parts of Congruent Triangles are Congruent |
| Corollary | A theorem that follows easily from a previously proved theorem. |
