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Transcript
Two-Dimensional Figures Geometry Ms. Hough 1-6 Vocabulary A polygon is a closed figure whose sides are all segments. A polygon’s sides intersect exactly two other sides, but only at their endpoints. Examples: Convex or Concave A Polygon is concave if any side can be extended so that it appears in the interior of the polygon. A polygon is convex if the sides can be extended and does not intersect the interior of the polygon. Number of Sides 3 4 5 6 7 8 9 10 12 n Polygon Name Triangle Quadrilateral Pentagon Hexagon Heptagon Octagon Nonagon Decagon Dodecagon n-gon A regular polygon is a convex polygon in which all sides and angles are congruent. You are now able to classify polygons with three categories Name Concave/Convex Regular/Irregular Give it a try To find the perimeter of a polygon find the SUM of the length of every side. Example Refer to PQR with vertices P(-1,3), Q(-3, -1) and R(4, -1) a) Find the Perimeter of b) Find the area of PQR PQR Class Work Complete the work sheet handed out. Make sure to explain your reasoning for your classifications, and SHOW YOUR WORK for the remaining problems. This will be collected and graded tomorrow. When you are finished, go to GeometryOnline.com and complete the Vocabulary Review