| A | B |
|---|
| acute angle | an angle with a measure greater than 0 degrees and less than 90 degrees |
| adjacent angle | angles that are next to each other and have a common side |
| congruent | having exactly the same size and shape |
| diameter | a line segment that passes through the center of a circle and has endpoints on the circle |
| equilateral triangle | a triangle with all three sides the same length |
| obtuse angle | an angle with a measure greater than 90 degrees and less than 180 degrees |
| radius | a line segment from the center of a circle to any point on the circle |
| right angle | an angle with a measure of 90 degrees |
| tessellation | an arrangement of shapes that covers a surface completely without overlaps or gaps |
| veritcal angles | when two lines intersect, the angles that do not share a common side |
