Polygons

http://math.com/school/subject3/lessons/S3U2L1GL.html

There are many different types of polygons some examples are a pentagon (5 sides), a hexagon (6 sides), a heptagon (7 sides), a octagon (8 sides), a nonagon (9 sides), and a decagon (10 sides.) To find an interior sum of a polygon you subtract the number of sides by two and then multiply that number by 180. - Jordan H