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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