30.	+Triangle+Interior+Angle+Sum+Theorem

The sum of the interior angles of any triangle is equal to 180º.

example problem 1: //m example problem 2:

2x + 16 + 3x - 6 + 4x - 28 = 180 9x + 16 - 6 - 28 = 180 9x - 18 = 180 9x = 198 x = 22

example problem 3:

The triangle sum theorem states that all interior angles of a triangle add up to 180º. So you must add up the three angle measurements and set them equal to 180º, and then algebraically solve for x, Once you have solved for x, you can then substitute that number into the equations to get the measure for each angle. (3x + 11)º + (4x - 5)º + 90º = 180º 7x = 84 x = 12  
 * LINKS!!!!!!!!**

 [|Triangle Interior Angle Theorem Problems]
[] [|http://www.geom.uiuc.edu/~dwiggins/conj04.html]