When you have more than two angles in a revolution, each of the angles adds to 360[math]^\circ[/math]. In the example below, you can adjust [math]\angle[/math]ABC (also angle [math]\beta[/math] in the slider). Author's note: if you make this angle more than 280[math]^\circ[/math], things start to get a little messy. Notice that all three angles add up to 360[math]^\circ[/math].[br][br]When more than two angles share a vertex, it is called "angles at a point".