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# geometry -beth

### Chrysalis geometry vocabulary

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

ray | a line that starts at a point and continues on forever |

Acute angle | Having fewer than 90 degrees |

Angle | Where two rays join |

arc | A continuous part of a circle; measured by the degrees formed by the two radii at the endpoints of the arc |

chord | A segment whose endpoints are on a circle |

circumference | Distance around a circle |

compass | Tool used to draw circles and arcs |

concave | In a polygon, a vertex is a point inside the polygon |

congruent | Shapes having the exact shape and size |

convex | None of the vertices in a polygon are contained inside the polygon |

coordinates | Numbers that correspond to a point on a line or graph |

degree | Angle measure |

diagonal | Segment that connects two vertices, but is not a side of a polygon |

diameter | Chord that passes through the center point of a circle |

equilateral | All sides have the same length |

hexagon | Polygon with six sides |

isosceles | A triangle with two equal sides |

line segment | A line that has two endpoints |

obtuse angle | Having between 90 and 180 degrees |

parallel | Always the same distance apart |

pentagon | A polygon with five sides |

perpendicular | Intersecting lines forming right angles |

polygon | Closed, plane figure formed by line segments meeting at their endpoints |

protractor | A device for measuring degrees in angles |

quadrilateral | A polygon with four sides |

radius | A segment from the center point to a point onthe circle |

rectangle | A quadrilateral with four right angles |

rhombus | A parallelogram with four congruent sides |

right angle | Having exactly 90 degrees |

scalene triangle | A triangle with no congruent (equal) sides |

similar | Shapes having the exact shape, but a different size |

square | A quadrilateral with four right angles and four congruent sides |

symmetry | If you divide a shape in the middle, both sides are identical |

trapezoid | A quadrilateral with only one pair of parallel lines |

triangle | A polygon with 3 sides |

vertex | Common endpoint of two rays that form an angle |

Created by:
bethdmorrison