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# 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

by CK-12 //basic
Represent three-dimensional objects in two dimensions.
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## Nets - Overview

by CK-12 //basic
Overview
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## Three Dimensions in Two Dimensions Principles - Basic

by CK-12 //basic
This video provides the student with a walkthrough on three dimensions in two dimensions.
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## Three Dimensions in Two Dimensions Examples - Basic

by CK-12 //basic
This video provides the student with a walkthrough of one or more examples from the concept "Three Dimensions in Two Dimensions".
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## Geometry Nets

by CK-12 //basic
Learn about nets by "unfolding" a 3-dimensional figure.
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## Nets - Example 1

by CK-12 //basic
Determining whether a net will form a cube or cuboid when folded
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