Results 1 to 2 of 2

Math Help - Circle Geometry Question

  1. #1
    Junior Member
    Joined
    Sep 2008
    Posts
    49

    Circle Geometry Question

    Hi, I have a question on circle geometry... Its looks quite simple (I would think) but I dont know how to do it.

    Two circles of radii 5cm and 8cm touch each other externally. Calculate the length of the common tangent.

    Thanks.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,706
    Thanks
    1637
    Awards
    1
    If you draw the diagram correctly, then you will see a trapezoid with two right angles as base angles. The lengths of the two parallel sides are 5 & 8. The length of the summit is 13. Thus you need to find the length of the base.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Circle Geometry: Trivial QUestion on Chords?
    Posted in the Geometry Forum
    Replies: 1
    Last Post: July 3rd 2010, 03:46 AM
  2. Circle Geometry - five question
    Posted in the Geometry Forum
    Replies: 5
    Last Post: August 24th 2009, 07:03 PM
  3. question to with geometry of a circle
    Posted in the Geometry Forum
    Replies: 3
    Last Post: April 30th 2009, 07:11 PM
  4. Circle Geometry Question
    Posted in the Geometry Forum
    Replies: 5
    Last Post: January 15th 2009, 11:16 AM
  5. Replies: 1
    Last Post: July 2nd 2007, 11:04 PM

Search Tags


/mathhelpforum @mathhelpforum