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Interior Angles of a Triangle
The interior angles of a triangle always add up to 180° (or radians). You can see that by putting the corners together and observing the straight line that they create.



Drag the corners of the triangle to change the angles but notice how the total of the angles never changes.


"Interior Angles of a Triangle" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/InteriorAnglesOfATriangle/
Contributed by: Jon McLoone
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