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Area & Perimeter
Circles - A&P
Fun with Circles
Quads - A&P
Decimals to Inches
Sphere & Torus
Sphere Vol Formula
Cylinders Vol & SA
Net 3-4-5 Prism
Net Right Tri Prism
Net Hexagon Prism
Net Octagonal Prism
Nets for 3 Pyramids
Lateral SA and Vol
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Lesson 2: Cross-sections of Solids
Hands on introduction to cross-sections:
Students should complete a hands-on activity with toilet paper tubes. The tubes can be cut to show the cross sections.
Toilet Paper Tube
- This activity should be used to illustrate the different results students will get with the toilet tube before working on SketchUp.
Identify solids through an investigation of cross sections. [
Learning Objective: Students should begin to see a difference between polyhedra (prisms and pyramids) with polygonal faces and non-polyhedral (cones, cylinders, spheres).
: no audio recorded
Create a variety of solids (or use the files prepared in Lesson 1) and drag a cross section through each solid. Discussion questions to ask include:
Name a figure and location of the plane where the cross section slice is constant (same shape and size) as you move the section tool through the figure.
Name a figure and location of the plane where the cross section slice is a
but the polygon shrinks/grows as you move through the figure.
Name a shape where the cross section slice is not a polygon as you move through the figure. Where is the plane located?
Name a figure where the slice is curved (parabolic) and note the location of the plane.
Can you classify or categorize the solids by using distinct properties of the cross section slices?
Teacher Notes and files:
Prepared SketchUp file (Use your files from Activity #1), discussion questions, physical models
: A polyhedron (plural polyhedra or polyhedrons) is a geometric solid in three dimensions with flat faces and straight edges.
June 2014 - Updated
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