1. Friday, Feb. 22, 2013 Agenda: TISK & No MM HW Check Lesson 10-1: Polygons Homework: 10-1 problems in packet A B C 35 21

2. HW Check 1) 0.4226 2) 0.9848 3) 0.5000 4) 0.3584 5) 0.9744 6) 0.4848 7) 4.0108 8) 0.5000 9) 2.4751 10) 0.5317

3. §10.1 Polygons  Definitions:  Polygon  A plane figure that…  Is formed by 3 or more segments called sides and… ..each side intersects exactly 2 other sides, one at each endpoint. PolygonNot a Polygon

4. Definitions…  Convex  No line that contains a side of the polygon also contains a point in the interior of the polygon.  Concave  Not convex (also called nonconvex)  Has a “cave in” §10.1 Polygons

5.  Equilateral  All sides are congruent  Equiangular  All angles are congruent  Regular  Both equilateral AND equiangular §10.1 Polygons

6.  Diagonal  A segment that joins two nonconsecutive vertices. §10.1 Polygons

7. Names of Polygons NameNumber of Sides Triangle3 Quadrilateral4 Pentagon5 Hexagon6 Heptagon7 Octagon8 Nonagon9 Decagon10 Dodecagon12 n-gonn §10.1 Polygons

8. Interior Angles §10.1 Polygons

9. Exterior Angles §10.1 Polygons

10. Practice  If each interior angle of a regular n-gon is 108º, how many sides does the polygon have? §10.1 Polygons

11. Practice  Find the value of x. §10.1 Polygons