| Hint | Answer |
| Formed by two noncollinear rays that have a common endpoint. | |
| An angle that measures less than 90 degrees. | |
| Angles that have a common vertex and share a side. | |
| Part of a line; it has one endpoint and extends infinitely in one direction. | |
| Two nonadjacent angles formed by two intersecting lines. | |
| An angle that measures 90 degrees. | |
| An angle that measures greater than 90 degrees. | |
| Lines that intersect at 90 degree angles. | |