Hmmm I seem to be stumped on this question.(adsbygoogle = window.adsbygoogle || []).push({});

Prove that the sum of the exterior angles at opposite verticies of any quadrilateral is equal to the sum of the interior angles at the other two verticies?

I dont really have a start because I cant seem to get my mind wrapped around where to begin.

I know the sum of exterior angles is 360 degrees. And the sum of interior angles in a quadilateral is equal to 360 degrees aswell.

I dont know where to go from there.

Hint or Help please

thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Proof in Geometery

**Physics Forums | Science Articles, Homework Help, Discussion**