May 16, 2015

Students understand the definition of a general pyramid and cone and that their cross sections are similar to the base.

Students show that if two cones have the same base area and the same height, then cross sections for the cones the same distance from the vertex have the same area.

Teacher and Student versions of full lesson from engageNY

- Mathematics > General
- Mathematics > Geometry

- Grade 9
- Grade 10

Make sense of problems and persevere in solving them.

Reason abstractly and quantitatively.

Use appropriate tools strategically.

Attend to precision.

Look for and make use of structure.

Identify the shapes of two-dimensional cross-sections of three-dimensional objects, and identify three-dimensional objects generated by rotations of two-dimensional objects.