1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Help with Finding Angles of an Octagon

  1. May 27, 2014 #1
    Hi all

    I was wondering if someone could help with the following:-

    I have a regular octagon.

    Find angle CBA, ACB, BAC.

    Lines BA and AC are equal in length.


    I have done the following:-

    Found all the internal angles and all the external angles.

    I know that I have an isosceles triangle because BA & AC are equal so the base angles are equal.

    My guys felling is that I need to divide 135 by 2 to get 67.5, so my base angles ate 67.5, 67.5 and my third angle is 45.

    But I cannot explain why I dividing 153 by 2 gives the correct answer can anyone explain?
     

    Attached Files:

  2. jcsd
  3. May 27, 2014 #2

    verty

    User Avatar
    Homework Helper

    For me, the easiest way to do this is to start with angle ##\hat{A}##, you should be able to find it without knowing any other angles. Hint: extend AC and BC past A.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Help with Finding Angles of an Octagon
  1. Find the angle (Replies: 7)

  2. Finding an angle (Replies: 10)

  3. Find this angle (Replies: 1)

Loading...