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# Taylor's Math

### Shapes and Designs Vocabulary Words Study Guide

Vocabulary Word | Definition |
---|---|

triangle | three sides |

quadrilateral | four sides |

pentagon | five sides |

hexagon | six angles and six sides |

heptagon | seven sides |

octagon | eight sides |

nonagon | nine sides |

decagon | ten sides |

equilateral triangle | triangle with all equal sides |

straight angle | an angle with 180° |

degrees | a unit of measurement |

right angle | an angle of 90° |

ray | a line from a point that goes on forever in one direction from that point |

acute angle | an angle of less than 90° |

vertex | the intersection of two sides of a plane figure to form an angle |

isosceles triangle | a triangle with two equal sides |

obtuse angle | an angle greater than 90° but less than 180° |

scalene triangle | a triangle with no equal sides |

parallelogram | a quadrilateral having both pairs of opposite sides parallel to each other |

rotation symmetry | when you rotate (or turn) a figure around a center point by fewer than 360° |

reflection symmetry | two halves that are mirror-images of each other |

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

irregular polygon | have sides of differing lengths and angles of differing measure |

parallel lines | are lines that never intersect |

transversal | a line that passes through two or more lines |

tiling | laying down shapes in a pattern |

square | a rectangle having all four sides of equal length |

rectangle | A parallelogram with four right angles. |

line | a straight figure that is 180° and goes on forever |

dodecagon | 12 sides |

line segment | a line that has two end points |

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