E2 Students are expected to identify, describe, and represent the various cross-sections of cubes and rectangular prisms. Questions to Ask Myself.
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What does a cube look like? How many faces does it have? What do I know about each face? How many edges does it have? How many vertices does it have? Can I create a net for a cube?
Remember a net is a pattern or template that can be cut and folded to make a geometric solid.
What are the properties of a rectangular prism? Can I create a net for this solid?
What is a cross-section of a solid? How do I identify one? How do I describe it and represent it?
Let’s create several cross-sections for a circular cone. We can make cross-sections by cutting a cone in several different ways:
Scan shape for plane of symmetry cut
We can make cross-sections of a prism by:
1. Work within your assigned group to complete the activity for each material. Your group will be called to complete the Center 2 activity.2. For each activity, visualize the shape that will be made when you make a cross-section of that solid. Record your prediction. . 3. Use one of the solids at your center and the other materials to make the cross-section you visualized. Record your result.4. Now repeat the procedure 1 to 3 for the same solids at the center.
4 Rice crispie squares
1 clear cube
4 Plasticine rectangular prisms
4 Cheese cubes
Scan 5-76 sketches.
If geoblocks are available, cubes, square prisms, and rectangular prisms can be built in a variety of ways; thereby, some cross-sections of these prisms can be demonstrated without having to cut.
Optional Activity can be incorporated into the lessons.