# Cross-Sections and Nets

## Cross-sections are intersections of a plane with a solid, and nets are unfolded, flat representations of the sides of a 3-D shape.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Cross-Sections and Nets

This concept teaches students two ways to represent three dimensions in two dimensions: cross-sections and nets.
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## Nets of Solid Figures

Discover how to match a solid figure to its net and a net to its solid figure.
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• PLIX

## Cross-Sections and Nets: Cereal Box Blueprint

Cross-Sections and Nets Interactive
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• Video

## Cross Sections and Nets Principles

This video gives more detail about the mathematical principles presented in Cross Sections and Nets.
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• Video

## Cross Sections and Nets Examples

This video shows how to work step-by-step through one or more of the examples in Cross Sections and Nets.
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• Critical Thinking

## Cross-Sections and Nets Discussion Questions

A list of student-submitted discussion questions for Cross-Sections and Nets.
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• Real World Application

## Hold the Mail!

Watch as a Priority Mail package is constructed from its net into a box.
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• Real World Application

## Origami in Outer Space

Learn about the geometry that links the craft of origami to aerospace engineering.
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• Real World Application

## Womb with a View

Learn how cross-sections are used to create 3D and 4D ultrasounds.
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• Real World Application

## The Body Factory?

Discover how 3D printing will revolutionize medicine.
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• Study Guide