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# 2D Geometry

### Shapes, perimeter, and area

Question | Answer |
---|---|

Area | the number of square tiles that can fit on the inside of a shape |

Perimeter | the distance around the edge of a shape; pe(rim)eter |

Complementary Angles | two angles that total 90 degrees when added together |

Supplementary Angles | two angles that total 180 degrees when added together |

Right Scalene Triangle | a triangle with one right angle and two acute angles. three sides with different lengths and three angles with different measures. |

Right Isosceles Triangle | a triangle with one right angle and two acute angles. two equal sides and two equal angles. |

Acute Equilateral Triangle | a triangle with three acute angles each measuring 60 degrees and three equal sides |

Acute Isosceles Triangle | a triangle with three acute angles. two equal sides and two equal angles. |

Acute Scalene Triangle | a triangle with three acute angles. three sides with different lengths and three angles with different measures |

Obtuse Isosceles Triangle | a triangle with one obtuse angle and two acute angles. two equal sides and two equal angles. |

Obtuse Scalene Triangle | a triangle with one obtuse angle and two acute angles. three sides with different lengths and three angles with different measures. |

Square | four equal sides. four 90 degree angles |

Rhombus | four equal sides. opposite angles equal. |

Rectangle | four 90 degree angles. opposite sides equal. |

Parallelogram | two sets of parallel sides. opposite sides equal. opposite angles equal. |

Trapezoid | one set of parallel sides. |

Polygon | a shape with no gaps. made of straight lines. |

Sum of Angles in a Triangle | 180 degrees |

Sum of Angles in a Quadrilateral | 360 degrees |

Area Formula for a Square | s x s |

Area Formula for a Rectangle | l x w or b x h |

Area Formula for a Parallelogram | b x h |

Area Formula for a Triangle | b x h / 2 |

Area Formula for a Trapezoid | (base one + base two) x h / 2 |

Base | flat bottom side that shape sits on |

Height | straight line from top of shape to the bottom. makes right angle with base. |

Created by:
l0803220