The perimeter of an decagon is 13. Calculate side, area

s = | P |

10 |

s = | 13 |

10 |

s = 1.3

A = 5/2s

A = 2.5(1.3)

A = 2.5(1.69)(3.3)

A =

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

Interior Angle Sum = (10 - 2) x 180°

Interior Angle Sum = 8 x 180°

Interior Angle sum = 1440°

Diagonals = | n(n - 3) |

2 |

Diagonals = | 10(10 - 3) |

2 |

Diagonals = | 10(7) |

2 |

Diagonals = | 70 |

2 |

Diagonals =

1 vertex Diagonals = n - 3

1 vertex Diagonals = 10 - 3

1 vertex Diagonals =

Triangles = N - 2

Triangles = 10 - 2

Triangles =