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# Math Terms

### Chapter 7 Geometry

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

Adjacent Angles | Two angles that share a common side and have the same vertex. |

Congruent Angles | Angles that have the same measure. |

Vertical Angles | Opposite angles formed by the intersection of two lines. Vertical angles are congruent. |

Complementary Angles | Two or more angles with a sum of 90 degrees. |

Supplementary Angles | Two or more angles with a sum of 180 degrees. |

Perpendicular Lines | Lines that intersect to form right angles. |

Parallel Lines | Lines in the same plane that do not intersect. |

Transversal | A line that intersect two or more lines. |

Scalene Triangle | A triangle with no congruent lines. |

Isosceles Triangle | A triangle with exactly two congruent sides. |

Equilateral Triangle | A triangle in which all sides are congruent. |

Acute Triangle | A triangle in which all angles are acute. |

Obtuse Triangle | A triangle that has exactly one obtuse angle. |

Right Triangle | A triangle that has exactly one right angle. |

Parallelogram | A quadrilateral with two pairs of congruent parallel sides. Opposite angels are congruent. |

Rectangle | A parallelogram with four right angels. |

Rhombus | A parallelogram with four congruent sides. |

Square | A parallelogram with four congruent sides and four congruent angels. |

Kite | A quadrilateral with two pairs of congruent, adjacent sides. Opposite sides are not congruent. |

Trapezoid | A quadrilateral with exactly one pair of parallel sides. |

Scale Drawing | A proportional, two-dimensional object that accurately represents an actual object. |

Scale Model | A proportional, three-dimensional object that accurately represents an actual object. |

Scale | A ratio that compares the measurements of the drawing or model to the actual measurements of an object. |

Scale Factor | A scale without units (A scale can be written without units when the units are the same.) |

Acute Angle | An angle with a measurement less than 90 degrees. |

Right Angle | An angle with a measurement of exactly 90 degrees. |

Obtuse Angle | An angle with measurement greater than 90 degrees, but less than 180 degrees. |

Straight Angle | An angle with a measure of exactly 180 degrees. |

Point | An exact location. It is the building block of geometry. |

Line | A series of points with no end. |

Plane | A perfectly flat surface that extends infinitely in all directions. |

Ray | Part of a line with only one endpoint that extends without end in one direction. |

Line Segment | Part of a line or ray that extends from on endpoint to another. |

Angle | Two rays with a common endpoint. |

Vertex | The common endpoint of two rays that form an angle. |

Created by:
acoppola9