Can you find the area of a triangle without knowing the height? Applying trigonometry makes quick work of this type of problem. The video instructor presents problems for scholars to consider and then provides a worked out solution. She emphasizes naming conventions throughout the lesson.

Concepts

area of triangles, trigonometric ratios

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Additional Tags

math

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Instructional Ideas

• Create a guided notes document for pupils to complete as they watch the video
• Record new formulas and examples in a graphic organizer

Classroom Considerations

• Relies on prior knowledge of trigonometric ratios

• This video is hosted on YouTube

Pros

• Encourages learners to show their work as they complete the problems
• Includes a link to additional instruction on the same concept

Cons

• None

Common Core

SL.9-10.2 HSG-SRT.D.9 RST.9-10.7