Math Help Forum: apothem

  1. November 3rd, 2010, 10:51 PM #1
    aeroflix
    aeroflix is offline
    Member
    Joined
    Sep 2009
    Posts
    106

    apothem

    the radius of a circle is 1000 inches. find the apotherm of a regular pentagon inscribed in the circle
    Follow Math Help Forum on Facebook and Google+

  2. Welcome to Math Help Forum - Click here to Register

    Welcome to the largest Math Help Forum, a free community dedicated to math help and math discussions.

    We welcome everyone and the community is free to join so register today and become part of our math family!

  3. November 4th, 2010, 01:01 AM #2
    Opalg
    Opalg is offline
    MHF Contributor
    Opalg's Avatar
    Joined
    Aug 2007
    From
    Leeds, UK
    Posts
    4,039
    Thanks
    1
    Quote Originally Posted by aeroflix View Post
    the radius of a circle is 1000 inches. find the apotherm of a regular pentagon inscribed in the circle
    The apothem is the red line. The radius of the circle is the blue line. What is the angle between them? Can you use some simple trigonometry in the red-blue-black triangle to find the connection between the apothem and the radius?
    Attached Thumbnails Attached Thumbnails apothem-apothem.png  
    Follow Math Help Forum on Facebook and Google+
« corresponding side | Shrtest distance between fly and spider in a room. »

Similar Math Help Forum Discussions

  1. What is the area of a regular pentagon if its apothem has a length of 4 feet and each
    Posted in the Geometry Forum
    Replies: 3
    Last Post: September 5th, 2009, 05:21 PM
  2. Apothem
    Posted in the Trigonometry Forum
    Replies: 7
    Last Post: August 20th, 2008, 04:34 PM
  3. Apothem
    Posted in the Geometry Forum
    Replies: 3
    Last Post: April 20th, 2008, 01:58 PM

/mathhelpforum @mathhelpforum