| A | B |
|---|
| exterior angles | When the sides of a triangle are extended, the angles that are adjacent to the interior angles. |
| equilateral | A triangle with 3 congruent sides. |
| adjacent sides | Two sides of a triangle with a common vertex. |
| isosceles | A triangle with at least 2 congruent sides. |
| acute triangle | A triangle with 3 acute angles. |
| obtuse triangle | A triangle with one obtuse angle. |
| legs | The two congruent sides of an isosceles triangle that has only two congruent sides. |
| base | The noncongruent side of an isosceles triangle that has only two congruent sides. |
| hypotenuse | In a right triangle, the side opposite the right angle. |
| vertex angle | The angle opposite the base of an isosceles triangle. |
| base angles | The two angles that contain the base of an isosceles triangle. |
| equiangular | A triangle with three congruent angles. |
| interior angles | When the sides of a triangle are extended, the three original angles of the triangle. |
| scalene | A triangle with no congruent sides. |
| legs | In a right triangle, the sides forming the right angle. |
| right triangle | A triangle with one right angle. |
| vertex | Each of the three points joining the sides of a triangle. |
| 0 | How many obtuse angles can a right triangle have? |
| always | An equilateral triangle is ________ an isosceles triangle. |
