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# Geometry words

### 46 Geometry words

Question | Answer |
---|---|

Acute Angle | An angle that is smaller than 90 digrees. |

Angle | The figure formed by two rays that meet at a common endpoint. |

Center | A point from which every point on a circle is the same distance. |

Circle | Asimple closed curve;all the points on the circle are the same distance from the center point. |

Congruent Figures | Figures that have same size and shape. |

Degree | A unit used to measure angles. |

Diameter | A line segment that passes through the center of a circle and has both end points on a circle. |

Edge | The line segment where two faces of a soild figure meet. |

equilateral Triangle | Atriangle whose three sides are congruent. |

End Point | The point at the end of a line segment or ray. |

Intersecting Line | Lines that meet or cross at a common point. |

Isosceles Triagle | Atriangle with at least two sides that are equal in length |

Line | A straight set of points that go on forever in opposite directions. |

Obtuse Angle | An angle that measures more than 90 digrees but less than 180. |

Half- turn symmetery | A figure that matches its image when its image when it is turned halfway around has half-turn symmetry. |

Rectangular Prism | A solid figure with six rectangular faces. |

Slide (translation) | The movement of a figure aloung a line without changing direction |

Ray | The part of a line that starts at an endpoint and goes on forever in one direction |

Rectangle | A parallelogram with four right angles |

Perpendicular lines | Intersecting lines in the same plane that form four right angles |

Line Segment | The part of a line between two endpoints |

Radius | A line segment with endpoints at the center of a circle and on the circle |

Straight Angle | An angle that measures 180 digrees |

Trapezoid | A quadrillateral with exactly one pair of parallel sides |

SimilarFigures | Figures that have the same shape.They may or may not be the same size |

Vertex | A common endpoint of two rays or line segment.In a soild figure,the point at witch three or more edges meet |

Perimeter | The distince around a shape |

Square | A parallelogram that has four right angles and four congruent sides |

Rhombus | An angle that measures 90 digrees.Itforms a square corner |

Volume | The number of cubic units needed to fill a soild figure |

Square Pyramid | A pyramid with a square base |

Area | The number of square units needed to cover a flat surface |

Quadrillateral | Any four-sided polygon |

Sphere | A solid figure that is shaped like a ball |

Parallelogram | A quadrilateral whoose opposite sides are parallel and congruent |

Turn | The movement of a figure around a point |

Scalene Triangle | A triangle with no sides that are equal |

Point | An exact location in space |

Triangle | A polygon with three sides |

Parallel lines | Lines in the same plane that never intersect |

Polygon | A simple closed flat figure made up of three or more line segment |

Tiangular Prism | A soild figure with two parallel triangular faces |

Plane | A flat surface that extends indefinitely in all directions |

Right Triangle | A triangle that has one right angle |

Protractor | The tool used to measure angles |

Created by:
cfreitas@stp