Lesson Plan
Better Lesson

Better Lesson: Three Dimensional Shapes

For Teachers 2nd Standards
While 3 Dimensional shapes are not mentioned specifically in the Common Core, they do include the term face which is more appropriate for 3D shape attributes.
Lesson Plan
Shodor Education Foundation

Shodor Interactivate: Cross Sections

For Teachers 9th - 10th Standards
This lesson utilizes the concepts of cross-sections of three-dimensional figures to demonstrate the derivation of two-dimensional shapes.