| A | B |
|---|
| scalene triangle | a triangle in which all three sides have different lengths |
| isosceles triangle | a triangle that has two equal sides and two equal angles |
| legs | the equal sides of an isosceles triangle |
| base | the third side of an isosceles triangle |
| base angles | the two angles of an isosceles triangle that touch the base (which are congruent or equal |
| vertex angle | the angle between the two legs of an isosceles triangle |
| equilateral triangle | a triangle that has three equal (or congruent) sides |
| acute triangle | a triangle that has three acute angles |
| obtuse triangle | a triangle that has one obtuse angle (and two acute angles) |
| right triangle | a triangle that has one right angle |
| equiangular triangle | a triangle that has three congruent angles |
