| Term | Definition |
|---|
| point | This marks and exact location in space. |
| line | An endless straight path. Has no end points |
| ray | Part of line that goes on forever in one direction. Has one end point. |
| line segment | Part of a line between two end points. |
| plane | An endless flat surgace. Named by three points. |
| angle | Formed by two rays with the same endpoint (vertex). |
| right angle | An angle that measures 90 degrees. |
| acute angle | An angle that measures less than 90 degrees. |
| obtuse angle | An angle that measures more than 90 degress. |
| straight angle | An angle that measures 180 degrees. |
| parallel lines | Lines, in the same plane, that never intersect. |
| Intersecting lines | Lines that cross at one point. |
| perpendicular lines | Lines that intersect at right angles. |
| polygon | A closed, plane (flat) figure, formed by three or more line segments. |
| regular polygon | A polygon that has sides of equal measure, and has angles of equal measure. |
| Triangle | 3 sides, 3 angles |
| Quadrilateral | 4 sides, 4 angles |
| pentagon | 5 sides, 5 angles |
| hexagon | 6 sides, 6 angles |
| octagon | 8 sides, 8 angles |
| Congruent | Figures that have the same size and shape. |
| Similar | Figures that have the same shape, but different sizes. |
| Line of Symmetry | A line that divides a figure into two congruent parts. |
| Angles of a Triangle | Add up to 180 degrees. |
| Angles of a Quadrilateral | Add up to 360 degrees. |
| Polyhedron | A solid figure with faces that are polygons. |
| prism | A polyhedron that has two congruent (exactly the same) bases. |
| pyramid | A polyhedron with only one base. |
| Edge | Line where two faces come together. |
| Faces | The flat surfaces of solid figures |
| Vertex (plural - verteces) | The point where several edges come together. |
| Transformation | Movement of a figure that does not change it's size or shape. |
| translation | Sliding of a figure in a straight line. The figure does not change direction. |
| hudjw | Flipping a figure over a line (mirror). Figure is now in the opposite direction. |
| Rotation | Turning a figure around a point (vertex). Placing your finger on one corner of the figure, and turing the object around your finger. |
Combine with other sets
Share on Facebook
Share on MySpace