1. POLYGONS

2. BUILDING POLYGONS We use line segments to build polygons. A polygon is a closed shape with straight sides.

3. POLYGON NOT A POLYGON

4. POLYGONS

5. Polygons may also be called 2D shapes or PLANE FIGURES. A PLANE is a flat surface. PLANE figures are flat, not solid or 3D.

6. Is it a polygon? U

7. ATTRIBUTES are characteristics or traits of a polygon or shape, such as: The number of sides The number of angles (corners) The length of sides The number of right angles

8. Compare and contrast. What attributes are the same? What are different?

9. triangle rectangle square Some polygons have special names.

10. quadrilateral pentagon hexagon octagon Some polygons have special names.

11. triangle rectangle square Let’s take a closer look at some special shapes. circle Are they all polygons?

12. What letter is inside the circle and the triangle? What letter is inside the rectangle but NOT in the circle? What letters are inside the triangle but outside the square? AB C D E F

13. triangle

14. rectangle

15. square

16. circle A circle is a PLANE (flat) figure but not a polygon. It does not have straight sides.