Introduce a special relationship with right triangles. Learners discover the ratio of the sides in a 30-60-90 triangle. After watching several examples and seeing two different methods, pupils find unknown sides in triangles. Scholars continue to work problems to practice finding lengths related to 30-60-90 triangles.

Concepts

special right triangles, right triangles, simplify radicals

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Instructional Ideas

• Create a graphic organizer with a picture of a 30-60-90 triangle to show the operations necessary to move from one known length to the others

Classroom Considerations

• Assumes the class understands how to simplify radicals
• Second lesson in a six-part unit exploring right triangles
• Find the video clips referred to in the presentation, as they do not play

• This video is hosted on YouTube

Pros

• Provides information on where to get additional support on simplifying radicals
• Includes an additional worksheet to provide extra practice if needed

Cons

• None