# Areas, Perimeters and Circumferences of Shapes

Summary table of formulas of the areas, the perimeters and the circumferences of shapes. Tables contains links to web sites where are details how to calculate them, how to use formulas and the calculator for each shape.

## Areas of Shapes

Topic Name | Formula |
---|---|

Area of Square | A = a × a |

Area of Rectangle | A = a × b |

Area of Rhombus | A = a × h |

Area of Rhomboid | A = a × h |

Area of Trapezoid | A = 1/2 × (a + c) × h |

Area of Circle | A = (π × d^{2}) / 4 = π × r^{2} |

Area of Ellipse | A = π × a × b |

Area of Triangle | A = 1/2 × a × h |

Area of Parallelograms | by the type |

## Perimeters and Circumferences of Shapes

Topic Name | Formula |
---|---|

Perimeter of Square | C = 4 × a |

Perimeter of Rectangle | C = 2 × (a + b) |

Perimeter of Rhombus | C = 4 × a |

Perimeter of Rhomboid | C = 2 × (a + b) |

Perimeter of Trapezoid | C = a + b + c + d |

Circumference of Circle | C = π × d = 2 × π × r |

Circumference of Ellipse | C ≈ π × √2 × (a^{2} + b^{2}) |

Perimeter of Triangle | C = a + b + c |

Perimeter of Parallelograms | by the type |