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# Geometry Vocabulary

### Unit Review

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

Ray | a part of a line that begins at a particular point (the endpoint) and extends forever in one direction |

Line | a two-dimensional object that has no endpoints and continues on forever in both directions |

line segment | part of a line connecting two points, it has definite end points |

Angle | the figure formed by two rays, called the sides of the angle, sharing a common endpoint (the vertex of the angle) |

vertex | the point at which the rays of an angle or the sides of a polygon meet; the plural form of the word is “vertexes” or “vertices” |

acute angle | an angle with a measure less than 90° |

obtuse angle | an angle with a measure more than 90° |

right angle | a 90° angle |

straight angle | a 180° angle |

reflex angle | an angle with a measure greater than 180° but less than 360° |

adjacent angle | two angles that are next to each other |

congruent sides | congruent sides or segments have the exact same length |

adjacent sides | two sides that share a common vertex |

parallel lines | lines that never meet; two parallel lines are always the same distance apart |

perpendicular | two lines that intersect at right angles |

regular polygon | a polygon in which all sides are the same length and all angles have the same measure |

polygon | a 2-dimensional figure formed by three or more line segments (sides) that meet only at their endpoints (vertices) to make a closed path; sides may not cross one another |

quadrangle | a polygon with four sides and four angles |

equilateral triangle | a triangle with all three sides equal in length, each angle of an equilateral triangle measures 60° |

isosceles triangle | a triangle with two sides equal in length |

scalene triangle | a triangle with no sides equal in length |

right triangle | a triangle with a right angle (90°) |

acute triangle | a triangle with three acute angles |

obtuse triangle | a triangle with one obtuse angle |

rhombus | a rhombus is a quadrilateral whose four sides are congruent; it has two pairs of parallel sides; squares are a type of rhombus with congruent angles |

square | a figure with four congruent sides and four right angles; a square is always a rhombus; all squares are considered rectangles |

rectangle | a figure with four sides and four right angles; opposite sides are parallel and congruent, a rectangle is sometimes a trapezoid; a rectangle is sometimes a square |

trapezoid | a quadrilateral with at least one pair of parallel sides |

parallelogram | a quadrilateral with two pairs of parallel sides; opposite sides have the same length and opposite angles have the same measure; all rectangles are parallelograms but not all parallelograms are rectangles because parallelograms do not necessarily ha |

concave polygon | a polygon with an angle measuring more than 180°; concave polygons look like they are collapsed or have one or more angles “dented” in |

convex polygon | a polygon is convex if there are no “dents” or indentations in it |

Created by:
hmcarew