**The sum of the measures of the interior angles of a triangle is 180 degrees.**

**Since all the sides of equilateral triangles are the same length, all the angles are the same...**

**The interior angles of an equilateral triangle are all 60 degrees.**

**What about a square? **

**That's easy! By definition, all the interior angles of a square are right angles -- That means that they are all 90 degrees.**

**What about other regular polygons? **

**To figure out the measure of the interior angles of a regular pentagon, hexagon, heptagon, etc, we need more than just a protractor! What if we needed to find the interior angle of a regular polygon with 100 sides? That might be a little difficult to draw!**

**Here are two methods to find the measure of the interior angles of a regular polygon:**

**For both methods, we will use the fact that the sum of the measures of the interior angles of a triangle is 180 degrees!**