It is special—given one length, you can find the other two. A segment of a basic geometry playlist provides the ratio of the lengths of sides of a 30-60 right triangle. The presentation shows how to use the ratio to find side lengths given any one length.

Concepts

right triangles, special right triangles, pythagorean theorem, ratios

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Additional Tags

math

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Instructional Ideas

• Use an equilateral triangle with its altitude to prove the ratios are those given in the video

Classroom Considerations

• Individuals should know how to simplify numerical expressions with radicals
• Expects students understand the parts of a right triangle

• This video is hosted on YouTube

Pros

• Contains a link to other CK-12 30-60-90 resources
• Includes worked examples

Cons

• None