Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size Small Size show me how

Normal Size Small Size show me how

# Unit 2 - Mr. Hunt

### 2D Geometry

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

side | line segment that make up a polygon |

angle | two rays or lines that share a common point or vertex |

congruent | equal in size or length |

parallel lines | two lines that would never intersect when headed in both directions forever |

perpendicular | two lines that intersect at a 90 degree angle |

straight angle | a 180 degree angle |

right angle | a 90 degree angle |

obtuse angle | an angle greater than 90 degrees |

acute angle | an angle less than 90 degrees |

vertical angles | the congruent opposite angles that are formed when two lines intersect |

adjacent angles | two angles that share a common side, line, or ray |

complimentary angles | two angles that sum to 90 degrees |

supplementary angles | two angles that sum to 180 degrees |

concave polygon | a shape or polygon that is curved inwards |

convex polygon | a shape or polygon that is curved outwards |

degree | a measure for angles |

exterior angles | the angle made outside of a shape |

interior angles | the angle made from the inside of a shape |

irregular polygon | a polygon where are all side and angles are not equal |

polygon | a many sided, closed figure |

protractor | a tool used for measuring and drawing angles |

regular polygon | a polygon with all sides equal in length and all angles equal in size |

rectangle | a quadrilateral where all angles are 90° and opposite sides are congruent |

reflectional symmetry | A type of symmetry where a line could be drawn and one half is a reflection of the other half |

rotation | a circular movement of a shape around a fixed point |

rotational symmetry | A type of symmetry where a shape can be rotated (less than a full turn) around a fixed point and remain the same |

tesselation | a pattern made of identical shapes |

transversal | a line that crosses at least two other lines |

triangle | a 3 sided polygon |

quadrilateral | a 4 sided polygon |

pentagon | a 5 sided polygon |

hexagon | a 6 sided polygon |

heptagon | a 7 sided polygon |

octagon | a 8 sided polygon |

nonagon | a 9 sided polygon |

decagon | a 10 sided polygon |

dodecagon | a 12 sided polygon |

rhombus | a 4 sided polygon where all sides are equal |

square | a 4 sided polygon where all sides are equal and all angles are 90° |

parallelogram | a 4 sided polygon with 2 pairs of parallel sides |

trapezoid | quadrilateral where only one pair of opposite sides are parallel. |

quadrants | a quarter of a circle made by two radiuses at a right angle |

Created by:
mrhunt