Working Backwards—2D Rotations

Wrap a 2-D figure around the y-axis to form a solid. Given two 3-D figures, pupils determine the 2-D figure that—when rotated around the y-axis—will generate the solid. The pupils then draw the 2-D shape on the coordinate plane in the desired location.

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CCSS: Designed
Instructional Ideas

  • Use 3-D rendering software to show rotations and contrast against cross-sections
  • Discuss creating two solids by having redundant parts
Classroom Considerations

  • Class members should understand creating solids through rotations

  • Includes a video demonstrating questioning techniques
  • Contains descriptions of misconceptions

  • None
Common Core