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Videos, worksheets, stories and songs to help Grade 8 students learn how to find missing sides and angles of similar triangles.

Similar triangles are triangles that have exactly the same shape, but are not necessarily the same size. When two triangles are similar, the ratios of the lengths of their corresponding sides are equal. We can use these properties of similar triangles to find missing sides and angles.

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More topics on similar triangles

Congruent and Similar Triangles

Determine congruent and similar triangles. Use similar triangles to solve problems.

Solving for Unknown Values Using the Properties of Similar Triangles

This video shows examples of determining unknown values using the properties of similar triangles.

Indirect Measurement Using Similar Triangles

This video explains how to use the properties of similar triangles to determine the height of a tree.

Similar Triangles

Students review the idea that the ratios of the lengths of corresponding sides of similar figures are equal. Students then use this idea to find missing segment lengths in similar figures.

Similar Triangles Find the missing side.

Proportions with similar figures find the missing length.

How to find a missing part of a triangle that is similar to another triangle.

How to find a missing side of a triangle that is similar to another triangle.