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# Unit 9 Geometry

### Triangles, Area, Volume

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

Acute Angle | angle smaller than 90 degrees |

Acute Triangle | a triangle with all acute angle |

Adjacent Angle | an angle next to another angle |

Complementary Angles | two angles that add up to 90 degrees |

Congruent | having the same measurements |

Degree | the measure of an angle |

Equilateral Triangle | a triangle with all three sides and angles are equal |

Isosceles Triangle | a triangle with two equal sides |

Obtuse Angle | angle larger than 90 degrees |

Obtuse Triangle | a triangle with one obtuse angle |

Opposite Side Angle Theorem | the largest angle is opposite the longest side, the smallest side is opposite the smallest angle, etc. |

Right Angle | angle measuring exactly 90 degrees |

Right Triangle | a triangle with one right angle |

Scalene Triangle | a triangle with no equal sides |

Triangle Inequality Theorem | two sides of a triangle, when added, have to be greater than the third side |

Supplementary Angles | two angles that add up to 180 degrees |

Area | the amount of space the shape covers; measured in square units |

Base | the bottom line of a 2D shape |

Cube | a 3D shape when all faces are the same size |

Decompose | to break down a shape into different shapes |

Formula | a mathematical rule that is written with symbols |

Height | how tall a shape is from the bottom to the top; has to be a straight line |

Length | how long a shape is from one side to the other |

Line Segment | a straight line from end point to end point; vertex to vertex |

Parallelogram | a shape with two pairs of parallel lines |

Quadrilateral | any shape with four sides |

Rectangle | a shape with four straight lines and four right angles |

Rectangular Prism | a 3D shape that has 6 faces, two of which are rectangles |

Trapezoid | a four sided shape that has only one pair of parallel sides |

Width | distance across from side to side |

Vertex | the point where two lines meet on a shape |

Volume | the amount of space an object takes up |