| A | B |
|---|
| right angle | A 90º angle. |
| vertex | A point common to two sides of an angle, polygon, or solid figure. |
| pentagon | A five sided geometric figure. |
| square | A rectangle having all four sides of equal length. |
| intersecting lines | Lines that cross each other. |
| perpendicular lines | Two lines that cross each other to form a 90º angle. |
| acute angle | An angle less than 90º. |
| chord | The line segment between two points on a given curve. |
| radius | A straight line extending from the center of a circle to the surface. |
| line segment | A part of a line that has two endpoints. |
| line | A straight, continuous and unending set of points on a plane. |
| point | An exact location in space represented by a dot. |
| rectangle | A quadrilateral with opposite sides parallel. |
| circle | A closed figure in which every point is the same distance from a given point called the center of the circle. |
| hexagon | A six sided geometric figure. |
| obtuse angle | An angle greater than 90º. |
| ray | Part of a line that starts at one endpoint and goes on without end in one direction. |
| verticle angles | Opposite angles formed by intersecting lines. They are always congruent. |
| supplementary angles | Two adjacent angles for which the sum equals 180º. |
| complementary angles | Two adjacent angles for which the sum equals 90º. |
| parallel lines | Lines that lie in the same plane and do not intersect. |
| plane | A flat surface made up of a continuous and unending collection of points. |
| adjacent angles | Angles next to each other that share a common side and a common vertex. |
