The area of an nonagon is 20. Calculate side, perimeter

A = 9/4s

s^{2} = | 4A |

9cot(180°/9) |

s^{2} = | 4 x 20 |

9cot(20) |

s^{2} = | 80 |

9 x 2.4 |

s^{2} = | 80 |

24. |

s

s = √3.23529096724

s = 7

P = 9 x side

P = 9 x 7

P =

Interior Angle Sum = (sides - 2) x 180°

Interior Angle Sum = (9 - 2) x 180°

Interior Angle Sum = 7 x 180°

Interior Angle sum = 1260°

Diagonals = | n(n - 3) |

2 |

Diagonals = | 9(9 - 3) |

2 |

Diagonals = | 9(6) |

2 |

Diagonals = | 54 |

2 |

Diagonals =

1 vertex Diagonals = n - 3

1 vertex Diagonals = 9 - 3

1 vertex Diagonals =

Triangles = N - 2

Triangles = 9 - 2

Triangles =