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Chapter 15 Lesson 3

Chapter 15 Lesson 3. Quadrilaterals and Other Polygons. A polygon. is a flat, closed figure that is made up of three or more straight line segments called sides . FLAT CLOSED 3 or MORE STRAIGHT SIDES. A vertex. is the point where two sides of a polygon meet. Show me a vertex !

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Chapter 15 Lesson 3

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  1. Chapter 15 Lesson 3 Quadrilaterals and Other Polygons

  2. A polygon • is a flat, closed figure that is made up of three or more straight line segments called sides . • FLAT • CLOSED • 3 or MORE STRAIGHT SIDES

  3. A vertex • is the point where two sides of a polygon meet. • Show me a vertex! • Hint- Remember the Very, Very Tickly spot?

  4. A polygon can be named by the number of sides it has. These Are Polygons:

  5. Triangle“tri” means 3 • 3 sides • 3 angles

  6. Quadrilateral“quad” means 4 • 4 sides • 4 angles

  7. Pentagon“pent” means 5 • 5 sides • 5 angles

  8. Hexagon“hex” means 6 • 6 sides • 6 angles

  9. Octagon“octo” means 8 • 8 sides • 8 angles

  10. These Are Not Polygons:Can you tell me why?

  11. Some Quadrilaterals Have Special Names

  12. A rectangle • has opposite sides that are parallel • four right angles.

  13. A square • has four sides of the same length • four right angles

  14. A trapezoid • has only one pair of parallel sides. What does that sound like? TRAP reminds me of a trap that gets skinnier and skinnier as you go in! Then, POOF! You are trapped!

  15. A parallelogram • has opposite sides that are parallel.

  16. A rhombus • has opposite sides parallel • four sides of the same length.

  17. Quadrilateral Game Each student needs to get one dice, a pencil, and a piece of paper.

  18. You and the person across from you are partners. If we have a group of 3, that is fine too!

  19. Take turns rolling the diceand name the figure that has that many sides.(1 and 2 rolls do NOT make quadrilaterals. Skip to the next player.)

  20. See how many you can quietly get right in the next 2 minutes.

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