| A | B |
|---|
| Acute Triangle | A triangle with three acute angles. |
| Base | The side of an isosceles triangle that is not congruent to the other sides. |
| Corollary | A theorem that follows easily from a previously proved theorem. |
| Equiangular Triangle | A Triangle with three congruent angles. |
| Equilateral Triangle | A Triangle with three congruent sides. |
| Exterior Angle | An angle that is adjacent to an interior angle of a triangle. |
| Hypotenuse | The side opposite the right angle in a right triangle. |
| Interior Angle | An angle on the interior of a triangle. |
| Isosceles Triangle | A triangle with at least two sides congruent. |
| Leg | One of the two congruent sides of an isosceles triangle. |
| Obtuse Triangle | A triangle with exactly one obtuse angle. |
| Right Triangle | A triangle with exactly one right angle. |
| Scalene Triangle | A triangle that has no congruent sides. |
| Vertex | A 'point' of a triangle. |
| Leg | A side of a right triangle that is adjacent to the right angle. |
