Classify shapes and solve problems using what we know of the properties of shapes.

Learn what it means for two figures to be congruent, and how to determine whether two figures are congruent or not. Use this immensely important concept to prove various geometric theorems about …

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Learn what it means for two figures to be similar, and how to determine whether two figures are similar or not. Use this concept to prove geometric theorems and solve some problems with polygons.

Classify shapes and solve problems using what we know of the properties of shapes.

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Access your personalized courses and learning resources on Khan Academy to enhance your knowledge in various subjects.

Take your knowledge of geometry into new territory! In this unit, we'll explore three-dimensional shapes and all the fascinating properties they possess. Get ready to think outside the box (or, in this case, …

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Join Khan Academy to access and explore interactive computer programming projects, including a spin-off of Karlson 3D.