| A | B |
|---|
| parallel lines | lines in the same plane that never intersect and are always the same distance apart |
| intersecting lines | lines that cross each other at exactly one point |
| perpendicular lines | lines that are at right angles (90 degrees) to each other |
| equilateral triangle | triangle with three equal sides |
| isosceles triangle | triangle with two equal sides |
| scalene triangle | triangle with no equal sides |
| circle | is a closed figure made up of points that are the same distance from the center |
| diameter | a line segment that passes through the center of a circle and has endpoints on the circle |
| radius | a line segment with one endpoint at the center of the circle |
| compass | a tool used to construct circles |
