Results 1 to 4 of 4

Math Help - Sector angles

  1. #1
    Member GAdams's Avatar
    Joined
    Apr 2007
    Posts
    171
    Awards
    1

    Sector angles

    I have a triangle (not right angled) in a circle.

    I know all the sides but none of the angles.

    Is there a formula to find an angle? I need to know the one at the centre of the circle.

    Thanks.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Forum Admin topsquark's Avatar
    Joined
    Jan 2006
    From
    Wellsville, NY
    Posts
    9,843
    Thanks
    320
    Awards
    1
    Quote Originally Posted by GAdams View Post
    I have a triangle (not right angled) in a circle.

    I know all the sides but none of the angles.

    Is there a formula to find an angle? I need to know the one at the centre of the circle.

    Thanks.
    Is this an actual triangle or a wedge (sector) of the circle?

    -Dan
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member GAdams's Avatar
    Joined
    Apr 2007
    Posts
    171
    Awards
    1
    Quote Originally Posted by topsquark View Post
    Is this an actual triangle or a wedge (sector) of the circle?

    -Dan
    Its a triangle in a circle. O is the centre, A and B are points on the circumference. AB is a chord. Sides OA = 3cm = OB. And AB is 4cm.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Forum Admin topsquark's Avatar
    Joined
    Jan 2006
    From
    Wellsville, NY
    Posts
    9,843
    Thanks
    320
    Awards
    1
    Quote Originally Posted by GAdams View Post
    Its a triangle in a circle. O is the centre, A and B are points on the circumference. AB is a chord. Sides OA = 3cm = OB. And AB is 4cm.
    The use the Law of Cosines or the Law of Sines to find your angles.

    -Dan
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. sector area
    Posted in the Geometry Forum
    Replies: 3
    Last Post: March 11th 2010, 04:16 PM
  2. Area of a sector
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: September 20th 2009, 04:57 PM
  3. area of a sector
    Posted in the Geometry Forum
    Replies: 2
    Last Post: September 23rd 2008, 02:41 PM
  4. Area of a Sector
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: August 15th 2008, 12:42 PM
  5. Sector Angle
    Posted in the Geometry Forum
    Replies: 1
    Last Post: June 3rd 2007, 03:57 AM

Search Tags


/mathhelpforum @mathhelpforum