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Lesson 1.4 - Polygons

Lesson 1.4 - Polygons. Geometry Homework: Lesson 1.4/1-26 all. Assignment from my web page: View PPT “Conjectures: aka Theorems and Postulates”. Answer the ‘Time to Ponder’ questions/1-16 (on white lined paper-no fringe) Due: Wednesday, October 2. Examples of polygons:. Con vex Polygon.

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Lesson 1.4 - Polygons

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  1. Lesson 1.4 - Polygons Geometry Homework: Lesson 1.4/1-26 all Assignment from my web page: View PPT “Conjectures: aka Theorems and Postulates”. Answer the ‘Time to Ponder’ questions/1-16 (on white lined paper-no fringe) Due: Wednesday, October 2

  2. Examples of polygons: Convex Polygon Concave Polygon

  3. Not Polygons

  4. Polygon • Means: “many-angled” • A polygon is a closed figure formed by a finite number of coplanar segments • Each segment intersects only at each endpoint.

  5. Two Types of Polygons: • Convex: If diagonals are drawn from the vertices of a polygon, all will be on the interior of the polygon

  6. 2. Concave: If diagonals are drawn from the vertices of a concave polygon, at least one diagonal will be exterior to the polygon. Visually, the polygon looks caved-in

  7. Polygons are classified according to the number of sides they have. *A polygon must have at least 3 sides .

  8. Can a slice of pizza be considered a polygon? Explain.

  9. Special Names for Polygons *n stands for number of sides. 23 23-gon

  10. Naming a Polygon Polygon ABCDE • Begin at any point • Follow the path of the polygon either clockwise or counterclockwise • MUST stay in order • Polygon Names • DCBAE • AEDCB • CDEAB…. E A D B C

  11. Diagonal The diagonal of a polygon is a line segment linking two non-adjacentvertices. Adjacent – next to *The diagonals are indicated with dashed lines.

  12. Diagonals in a Polygon 20 35 *n stands for number of sides.

  13. Equilateral Polygon Equilateral polygons are polygons in which all sides have equal lengths

  14. Equiangular Polygon Equiangular polygons are polygons in which all angles have equal measures

  15. RegularPolygon: A regular polygon is a polygon that is equilateral AND equiangular

  16. Try This

  17. E H N X G A

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