Regular polygons are polygons which have all sides equal and and angles equal. We'll dive into all of their basic properties, such as determining the relationship between sides and angles:

We'll even solve some riddles:

I am a peculiar quadrilateral. If you put 3 copies of me together, I can form an equilateral triangle. Similarly, if you put 3 copies of an equilateral triangle together, then they can form me! **What quadrilateral am I?**

By the end, you'll master complex relationships between these shapes and be able to solve problems like these:

**The grey shaded area is what fraction of the larger figure (that is, of the entire stellated pentagon)?**