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Geometry
| Term | Definition |
|---|---|
| base of a solid figure | a base of a solid figure is usually thought of as a face upon which it can sit; most solid figures have more than one base |
| plane | a flat surface that extends infinitely in all directions |
| y-coordinate | in an ordered pair, the value that is always written second |
| congruent | having exactly the same size and shape |
| y-axis | in a coordinate plane, the vertical axis |
| line of symmetry | a line that divides a figure into two congruent halves that are mirror images of each other |
| obtuse angle | an angle between 90° and 180° |
| partition | splitting shapes or numbers into smaller shares |
| quadrilateral | a four sided polygon |
| ray | a part of a line that has one endpoint and goes on forever in one direction |
| angle measurement | the measure of the size of an angle |
| x-axis | in a coordinate plane, the horizontal axis |
| x-coordinate | in an ordered pair, the value that is always written first |
| protractor | a tool used to measure and draw angles |
| endpoint | a point at either end of a line segment, or a point at one end of a ray |
| ordered pairs | a pair of numbers that gives the coordinates of a point on a grid (horizontal coordinate, vertical coordinate) |
| right rectangular prism | a prism with six rectangular faces where the lateral edge is perpendicular to the plane of the base |
| origin | the intersection of the x- and y-axes in a coordinate plane, described by the ordered pair (0,0) |
| coordinate system | 2-dimensional system in which the coordinates of a point are its distances from two intersecting , usually perpendicular, straight lines called axes |
| classify | to sort into categories or arrange into groups by attributes |
| coordinates | an ordered pair of numbers that identify a point on a coordinate plane |
| side of a polygon | any of the line segments that form a polygon |
| line | a set of connected points continuing without an end in both directions |
| intersecting lines | lines that cross at a point |
| attribute | a characteristics of an object, such at color, shape, size, etc. |
| circular arc | part of a circle between any two of its points |
| coordinate plane | a 2-dimensional system in which the coordinates of a point are its distances from two intersecting usually perpendicular, straight lines called axes (also called a grid) |
| angle | two lines that meet at a common point |
| acute angle | an angle less than 90° but more than 0° |
| perpendicular lines | two intersecting lines that form right angles |
| right angle | a 90° angle, such as the corner of a square |
| arc | part of a circle between any two of its points |
| solid figure | a geometric figure with three dimensions |
| tiling | a pattern of shapes repeated to fill a plane, the shapes do not overlap and there are no gaps |
| circle | a figure with no sides an no vertices |
| right triangle | a triangle that has one 90° angle |
| quadrants | the four sections of a coordinate grid that are separated by the axes |
| vertex | a point at which two or more sides of a geometric figure meet |
| parallel lines | lines that are always the same distance apart |
| degree | a unit for measuring angles, based on dividing a circle by 360 |
Created by:
mslind
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