Results 1 to 2 of 2
Like Tree1Thanks
  • 1 Post By johng

Math Help - Proof with common tangent

  1. #1
    Member Henderson's Avatar
    Joined
    Dec 2007
    Posts
    127
    Thanks
    2

    Proof with common tangent

    For both circles, line AD is a common tangent.

    Prove that m\angle ABD + m\angle ACD = 180

    Proof with common tangent-tangent.jpg
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    Joined
    Dec 2012
    From
    Athens, OH, USA
    Posts
    688
    Thanks
    281

    Re: Proof with common tangent

    Hi,

    I've attached a solution. I tilted your diagram so I could provide commentary.

    Proof with common tangent-mhfgeometry16.png
    Thanks from Henderson
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. common tangent line?
    Posted in the Calculus Forum
    Replies: 6
    Last Post: October 11th 2012, 10:09 PM
  2. Common tangent?
    Posted in the Calculus Forum
    Replies: 1
    Last Post: October 13th 2010, 04:57 AM
  3. Show(1/2)x^2 and ln(x) has common tangent
    Posted in the Calculus Forum
    Replies: 7
    Last Post: July 5th 2009, 12:51 PM
  4. common tangent line
    Posted in the Calculus Forum
    Replies: 1
    Last Post: December 25th 2008, 03:27 AM
  5. two radii with a common tangent
    Posted in the Geometry Forum
    Replies: 2
    Last Post: April 21st 2006, 12:36 PM

Search Tags


/mathhelpforum @mathhelpforum