| A | B |
|---|
| acute triangle | a triangle in which all of the angles are acute (less than 90 degrees) |
| base angles | are opposite the congruent sides |
| congruent triangles | triangles that have their corresponding parts congruent |
| equiangular triangle | a triangle with all angles congruent |
| equilateral triangle | a triangle with all sides congruent |
| exterior angle | an angle formed by one side of a triangle and the extension of another side |
| included angle | in a triangle, the angle formed by two sides is the included angle for those two sides |
| included side | the side of a triangle that is a side of each of the two angles |
| isosceles triangle | a triangle with at least two sides congruent |
| obtuse triangle | an angle with a degree measure greater than 90 and less than 180 |
| remote interior angles | the angles of a triangle that are not adjacent to a given exterior angle |
| right triangle | a triangle with a right angle |
| scalene triangle | a triangle with no two sides congruent |
