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# CAI Geometry Vocab 1

Term | Definition |
---|---|

Acute | angle that has a measure of less than 90 degrees |

Area | the measurement if square units of the interior region of a 2-dimensional figure |

Right | angle that has a measure of exactly 90 degrees |

Obtuse | angle that has a measure of more than 90 degrees |

Adjacent | two angles that lie in the same plane, have a common vertex and a common side, but not common interior points. |

Bisector | something that splits an object in 2 equal parts |

Distance | the length of a segment between two points |

Circumference | the distance around the outside of a circle calculated by 2πr or πd |

Collinear | on the same line |

Coplanar | on the same plane |

Complementary | two angles that add to 90 degrees |

Congruent | same size, same shape |

Construction | To draw a shape, line or angle accurately using a compass and straightedge |

Isometric Drawing | Way to draw a 3D figure where all objects and lengths the same size will be drawn the same size whatever their position. |

Linear pair | two adjacent angles that form a straight line |

Net | a 2-d pattern that can be folded to form a solid 3-d |

Midpoint | Midpoint-the point on a segment exactly halfway between the endpoints of the segment |

Orthographic Drawing | two-dimensional drawing of a three-dimensional object, using two or more additional drawings to show additional views of the object |

Perpendicular | intersecting to form right angles |

point | a defined position in space |

line | is made up of points, it has no thickness or width |

perimeter | the distance around a two-dimensional shape |

plane | flat surface made up of points that has no depth and extends indefinitely |

postulate/axiom | A statement, also known as an axiom, which is taken to be true without proof. That are the basic structure from which theorems are derived |

ray | a part of a line that begins at a point and continues without end in one direction |

segment | a measureable part of a line that consists of two points, called endpoints, and all of the points between them |

supplementary | two angles with measures that have a sum of 180o |

vertex | the corner of a plane polygon or of a prism |

vertical angles | 2 nonadjacent angles formed by 2 intersecting lines |

angle | the opening that is formed when two lines, line segments, or rays intersect |

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