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# C2_Chapter 10

### Chapter 10 Vocabulary

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

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

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

Acute Triangle | A triangle having three acute angles. |

Adjacent Angles | Angles that have the same vertex, share a common side, and do not overlap. |

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 90o |

Congruent Angles | Angles that have the same measure. |

Congruent Figures | Figures with equal corresponding sides of equal length and corresponding angles of equal measure. |

Congruent Segments | Segments having the same measure. |

Corresponding Sides | Congruent or proportional sides of similar figures. |

Decagon | A polygon having ten sides. |

Degree | Degree |

Equilateral Triangle | A triangle having three congruent sides. |

Hexagon | A polygon having six sides. |

Heptagon | A polygon having seven 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 halves that are reflections of each other. |

Line of Reflection | The line over which a figure is reflected. |

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

Nonagon | A polygon having nine sides. |

Octagon | A polygon having eight sides. |

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

Obtuse Triangle | A triangle having one obtuse angle. |

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

Pentagon | A polygon having five sides. |

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

Right Angle | An angle that measures 90°. |

Right Triangle | A triangle having one right angle. |

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

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

Rhombus | A parallelogram having four congruent sides. |

Scalene Triangle | A triangle having no congruent sides. |

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

Straight Angle | An angle that measures exactly 180°. |

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

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 that has 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. |

Created by:
Mrs_Irish