| A | B |
|---|
| triangle | a polygon with 3 sides |
| equilateral triangle | a triangle with three congruent sides |
| isosceles triangle | a triangle with at least two congruent sides |
| scalene triangle | a triangle with no congruent sides |
| right triangle | a triangle with one right angle |
| acute triangle | a triangle with all angles less than 90° |
| obtuse triangle | a triangle with one angle greater than 90° |
| congruent polygons | polygons that have the same size and shape |
| equiangular triangle | a triangle with 3 congruent angles |
| remote interior angles | interior angles that are not adjacent to the exterior angle |
| exterior angle | an angle formed by one side of the triangle and the extension of an adjacent side |
| congruence transformation | a transformation where the pre-image is congruent to the transformed image |
| reflection | flip |
| translation | slide |
| rotation | turn |
