1. SHAPES! Introduction to some basic polygons

2. What do you know already? How many shapes can you think of off the top of your head? Where have you seen these shapes before?

3. What is a polygon? 2 dimensional Closed Made of straight lines Which of these are polygons? No Yes No

4. Triangle Any three sided polygon Types of Triangles: Acute Obtuse Right Scalene Isosceles Equilateral Lets learn about the different kinds

5. Looking at side lengths Scalene Isosceles Two of the sides on the triangle are the same length All three sides of the triangle are different length Equilateral All three sides of the triangle are equal

6. Looking at the angles Acute ALL of the angles in the triangle is acute (less than 90°) Obtuse One of the angles in the triangle is an obtuse angle (greater than 90°) Right There is one right angle (90°) in the triangle

7. Parallelogram Four sided polygon Opposite sides are parallel

8. Rectangle Polygon 4 sides 4 right angles (90°) Parallelogram

9. Square Special type of rectangle Four EQAUL sides Four 90° angles Parallelogram

10. Rhombus Another parallelogram Opposite sides are parallel Four EQUAL sides Which is a rhombus?

11. Trapezoid Only one pair of opposite sides are parallel Four sides Polygon, but NOT a parallelogram

12. Pentagon Polygon 5 sided Regular Pentagon has 5 equal sides Which on is the regular pentagon and which is just a pentagon?

13. Hexagon http://minglearound.files.wordpress.com/2010/12/nuts-bolts-washers.jpg Polygon 6 sided Regular Hexagon has 6 sides of equal length

14. Octagon Polygon Eight sides Regular octagon has 8 sides of equal length Photo taken by Jillian Carey

15. Decagon Polygon Ten sided figure Regular decagon has ten equal sides Which one of these is the regular decagon?