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Geometry Holt 6.1 Notes 3.1 Page 382 POLYGON: Side: Vertex: Diagonal Naming Polygons: Diagonal: # of sides Name of Polygon Polygons are named by ___________________________. Tell whether the following figures are polygons. If so, identify them. A. B. ______________ C. _______________ _______________ D. ________________ Classifying Polygons: Polygons that have all congruent sides are called __________________. Polygons with all congruent angles are called _________________. Polygons that are both are called_________________. Example: of a regular polygon All of the following figures are considered to be CONCAVE polygons…. These figures are considered to be CONVEX polygons…. What observations can you make? Using these examples, can you form a good definition of each? Concave: Convex: Tell whether each polygon is regular or irregular....concave or convex. A. ________________________ B. _____________________ C. ______________________ Polygon Properties: Recall: The interior angles of a triangle will always add to What about polygons with MORE than three sides. What will their interior angles add up to? Quadrilateral # of triangles_________ Pentagon # of triangles_________ Hexagon # of triangles_________ What do you notice about the number of sides a polygon has, vs. the number of triangles formed by drawing all possible diagonals from one vertex? (Remember this for tomorrow!!!) _________________________________________________________________________________