Cross-sections when slicing three-dimensional figures

I use a computer simulation to show you cross-sections of various three-dimensional shapes, when they are cut with a plane. The cross section is always a two-dimensional shape, and varies quite a bit as the cutting angle varies (as you tilt the cutting plane).

Play with cross-sections yourself with these interactive activities from around the web:

• Cross-Section Flyer
• Cross-section animations made with GeoGebra
• Cross Sections of Solids

See also

How to calculate the area of a circle, plus simple proof for the formula — video lesson

Math Mammoth Geometry 3 — a self-teaching worktext with explanations & exercises (grade 7)

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