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# Section 6

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### Section 6

1. 1. 1.6 Two-Dimensional Figures
2. 2. Polygon <ul><li>A polygon is a closed figure formed by a finite number of coplanar sugments such that </li></ul><ul><ul><li>The sides that have a common endpoint are noncollinear, and </li></ul></ul><ul><ul><li>Each side intersects exactly two other sides, but only at their endpoints. </li></ul></ul>
3. 3. Polygon <ul><li>A polygon is name by the letters of its vertices, written in order of consecutive vertices. </li></ul>
4. 4. Polygon <ul><li>Polygons can be concave or convex. </li></ul><ul><li>Suppose the line containing each side is drawn. If any of the lines contain any point in the interior of the polygon then it is concave. Otherwise it is convex. </li></ul>
5. 5. Types of Polygons <ul><li>A polygon with n sides is an n-gon. </li></ul><ul><li>A convex polygon in which all sides are congruent and all the angles are congruent is called a regular polygon. </li></ul>
6. 6. Perimeter, Circumference, and Area <ul><li>The perimeter P of a polygon is the sum of the length of the sides of the polygon. </li></ul><ul><li>The circumference C of a circle is the distance around the circle. </li></ul><ul><li>The area A is the number of square unites needed to cover a surface. </li></ul>
7. 7. Triangle
8. 8. Square
9. 9. Rectangle
10. 10. Circle