Where does the line of rotation need to be to get a cone? Pupils respond to three questions involving rotating a right triangle about different lines. The scholars describe the solid created along with providing details about its dimensions.

Concepts

right triangles, triangles, rotations, 3-d, 3-d figures, 2-d, 2-d shapes, cones

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Additional Tags

math

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Instructional Ideas

• Have the class build a model of the solid of revolution
• Lead a discussion on what the general form of a base would be for solids created by revolutions

Classroom Considerations

• Individuals should be familiar with rotational solids

Pros

• The rubric includes descriptions of misconceptions at different levels of understanding
• Provides instructional implications for the various levels

Cons

• None

Common Core

HSG-GMD.B.4