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# Math Unit 5: Part 2

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

perimeter | The distance around a figure |

area | The number of square units needed to cover the region |

surface area | The sum of the areas of all of the faces of a solid figure |

line plot | A graph using marks along a number line to show how many objects are in a set |

protractor | A tool used to measure angles |

point | An exact location in space |

vertex | The point where two rays or lines meet to form an angle |

ray | A straight row of points that starts at one point and goes on forever in one direction |

angle | A geometric shape made by two rays from a common endpoint, called a vertex |

right angle | An angle that forms a square corner |

acute angle | An angle that is less than a right angle |

obtuse angle | An angle that is greater than a right angle |

decompose | To split up into parts |