Entering Into Polygons

Remember that all the sides are congruent in an equilateral polygon. All the angles are congruent in an equiangular polygon. A regular polygon is one that is both equilateral and equiangular. If a polygon is not regular, it is called irregular.

A polygon is either concave or convex.





Remember the Polygon Angle Sum Theorem:


And the Polygon Exterior Angle Sum Theorem:


Always remember that any polygon with four sides is a quadrilateral. However, some quadrilaterals have special properties. These special quadrilaterals are given their own names.

Here are some properties of parallelograms:



Holt Geometry Book

It is always important to note these theorems, mostly considering they are the bulk of what you will need to remember come test or quiz time, and like I said, I am a visual learner, so for me, this picture set up is golden.