The perimeter of an nonagon is 16. Calculate side, area

s = | P |

9 |

s = | 16 |

9 |

s = 8

A = 9/4s

A = 9/4(8)

A = 9/4(3.5)cot(20)

A = 7.1 x 2.4

A =

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 =