In section six, we learned about polygons and the different kinds of polygons. A polygon has to have three or more segments(sides) and each side intersects to other sides and each endpoint of a side is a vertex of the polygon.
TYPES OF POLYGONS!
3 sides triangle
4 sides quadrilateral
5 sides pentagon
6 sides hexagon
7 sides heptagon
8 sides octagon
9 sides nonagon
10 sides decagon
12 sides dodecagon
If there are 11 sides or more than 12 sides, than call it an n-gon or the number and then -gon.
a shape with 11 sides= an eleven-gon
a shape with 16 sides= a sixteen-gon

We also learned about Special Polygons
Concave Polygons: A side extended goes thru the interior of the polygon.
Convex Polygons: No line that contains a side goes thru the interior of the polygon.
Equilateral Polygons: All sides are congruent
Equiangular Polygons: All interior angles are congruent
Regular Polygon: Equilateral and equiangular

Area Formulas

Area for a square: length of a side squared
Area for a rectangle: product of base and height
Area for a triangle: one-half the product of the base and height.
Perimeter of any polygon: the sum of the lengths of all the sides
Area of a circle: the product of pi and the radius squared
Circumference of a circle: 2 multiplied by pi multiplied by the radius