1. Geometry
4.1 Whirlygigs for Sale!

2. 4.1 Rotating Two-Dimensional Figures through Space
Objectives
Apply rotations to two-dimensional plane figures to create three-dimensional solids
Describe three-dimensional solids formed by rotations of plane figures through space

3. 4.1 Rotating Two-Dimensional Figures through Space

4. Problem 1: Rectangular Spinners
Collaborate #1 c-f (4 Minutes)
Use the rectangle for the spinner: 1 per group

5. Problem 1: Rectangular Spinners
Collaborate #2 c-f (3 Minutes)
Use the circle for the spinner: 1 per group

6. Problem 1: Rectangular Spinners
Collaborate #3 c-f (3 Minutes)
Use the triangle for the spinner: 1 per group

8. Triangle
The height of the triangle is the height of the cone = 1 inch
The radius of the cone is half the base of the triangle = 1 inch

9. Cylinder
Rectangle

10. The height of the rectangle is the height of the cylinder
The radius of the cylinder is half the width of the rectangle = 1.5 inches

11. Sphere
Circle

12. Recap
When we rotate a rectangle to form a solid, what 3-D figure is created?
When we rotate a circle to form a solid, what 3-D figure is created?
When we rotate a triangle to form a solid, what 3-D figure is created?

13. Formative Assessment Skills Practice 4.1
Problem Set Pg (1-12)