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# Ch. 10 Geometry

### Jerkins 7th gr. Ch. 10 Vocabulary (Glencoe)

Word | Description |
---|---|

Acute Angle | An angle with a measure greater than 0 degrees and less than 90 degrees. |

Acute Triangle | A triangle having three acute angles. |

Angle | Two rays with a common endpoint from an angle. The rays and vertex are used to name the angle. |

Circle Graph | A type of statistical graph used to compare parts of a whole. |

Complementary Angles | Two angles are complementary if the sum of their measures is 90 degrees. |

Congruent Angles | Angles that have the same measure. |

Congruent Segments | Sides of a polygon that having the same length. |

Decagon | A polygon having ten sides. |

Degrees | The most common unit of measure for angles. If a circle were divided into 360 equal-sides parts, each part would have an angle measure of 1 degree. |

Equilateral Triangle | A triangle having 3 three congruent sides. |

Heptagon | A polygon having seven sides |

Hexagon | A polygon having six sides. |

Indirect Measurement | Finding a measurement by using similar triangles and writing a proportion. |

Isosceles Triangle | A triangle having at least two congruent sides. |

Line of Symmetry | A line that divides a figure into two haves that are reflections of each other. |

Line Symmetry | Figures that match exactly when folded in half have line symmetry. |

Nonagon | A polygon having nine sides. |

Obtuse Angle | Any angle that measures greater than 90 degrees but less than 180 degrees. |

Obtuse Triangle | A triangle having one obtuse angle |

Octagon | A polygon having eight sides. |

Parallelogram | A quadrilateral with opposite side parallel and opposite side congruent. |

Pentagon | A polygon having five sides. |

Polygon | A simple closed figure in a plane formed by three or more line segments. |

Quadrilateral | A closed figure having four sides and four angles. |

Reflection | A type of transformation where a figure is flipped over a line of symmetry. |

Regular Polygon | A polygon that has all sides and all angles congruent. |

Rhombus | A parallelogram having four congruent sides. |

Right Angle | An angle which measures exactly 90 degrees. |

Right Triangle | A triangle having one right angle. |

Scalene Triangle | A triangle having no congruent sides. |

Similar Figures | Figures that have the same shape and congruent angels but not necessarily the same size. |

Straight Angles | An angle that measures exactly 180 degrees. |

Supplementary Angles | Two angles are supplementary if the sum of their measures is 180 degrees. |

Tessellation | A repetitive pattern of polygons that fit together with no holes or gaps. |

Transformation | A movement of a geometric figure. |

Translation | One type of transformation where a geometric figure is slid horizontally vertically, or both. |

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

Triangle | A polygon with three sides and three angles. |

Vertex | A vertex of an angle is the common endpoint of the rays forming the angle. |

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

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jerkins