Geometry 4.1 Whirlygigs for Sale!

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

4.1 Rotating Two-Dimensional Figures through Space

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

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

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

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

Cylinder Rectangle

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

Sphere Circle

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?

Formative Assessment Skills Practice 4.1 Problem Set Pg. 419-421 (1-12)