# Unknown Measures of Similar Figures

## Use ratios and proportions to solve for missing lengths in similar figures.

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.
• Video

## Find an Unknown in a Proportion

by CK-12 //basic
Learn how to solve proportions for a variable.
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• Video

## Congruent and Similar Triangles

by CK-12 //basic
Explains congruent and similar triangles. Shows how to determine if triangles are similar.
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6
• Video

## Congruent and Similar Triangles - KA

by CK-12 //basic
Determines congruency and similarity between triangles.
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3