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# Unit 1 Vocabulary

### math

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

line | Most students know what a line is but it is important to note that a line has arrows in both directions, note it is different from a line segment that terminates with end points. |

line segment | A part of a line that terminates with a point at either end. |

ray | A mix between a line and a line segment, one end has a point, the other end an arrow. |

Plane | Think of a desktop that continues infinitely in all directions. |

Co-linear | Points that are co-linear would be points that fall on the same line. |

Midpoint | This is the exact middle of a line segment, it divides something into two equal halves. The formula for calculating a midpoint doesn't need to be memorized if you just remember that it is the average of the x-values and the average of the y-values. |

Acute angle | A "cute" small angle that is greater than 0 degrees but less than 90 degrees. |

Right angle | An angle that is exactly 90 degrees. |

Obtuse angle | An "obese" angle or fat angle, one that is greater than 90 but less than 180. |

Straight angle | A angle that forms a line and measures 180 degrees. |

Complementary | Two angles who sum to 90 degrees. |

Supplementary | Two angles who sum to 180 degrees. |

Adjacent angles | Angles that are next to each other. |

Linear Pair | Two adjacent angles that are supplementary. |

Bisect | Something that cuts into two equal pieces such as an angle bisector would cut the angle into two equal pieces. |

Vertical angle | Angles opposite each other (often form an X) - vertical angles are complementary. |

Perpendicular Bisector | Something that cuts into two equal pieces such as an angle bisector would cut the angle into two equal pieces. |

Distance between two points | Memorize distance formula or learn how to use the Pythagorean Theorem to find the distance between any two ordered pairs. |

Perimeter | Distance around an object. |

Area | the space inside a shape |

Radius | The distance from pne side from the center of the circle the one end of the circle. Radius is half the diameter |

Diameter | The distance from one side of a circle to the other going through the center of the circle. Diameter is twice the radius. |

Addition property of Equality | When you add the same number to both sides of an equation, it doesn't effect the equality of the equation. |

Subtraction property of Equality | When you subtract the same number from both sides of an equation, it doesn't effect the equality of the equation. |

Multiplication Property of Equality | When you multiply the same number to both sides of an equation, it doesn't effect the equality of the equation. |

Division Property of Equality |