The Sum of Opposite Angles of a Quadrilateral in a Circle is 180 Degrees

The sum of the opposite angles of a quadrilateral in a circle is 180°, as long as the quadrilateral does not cross itself.
Drag the vertices on the circle to change the angles.



  • [Snapshot]
  • [Snapshot]
  • [Snapshot]
    • Share:

Embed Interactive Demonstration New!

Just copy and paste this snippet of JavaScript code into your website or blog to put the live Demonstration on your site. More details »

Files require Wolfram CDF Player or Mathematica.

Related Curriculum Standards

US Common Core State Standards, Mathematics