Demonstrate the derivation of the trigonometric area formula for a triangle. Using the base/height formula and the sine ratio, the lesson instructor demonstrates how to combine the two and create the formula A = 1/2absinC. The video shows both the labeled triangle and the algebraic steps.

Concepts

area of triangles, trigonometry applications, trigonometric equations

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Additional Tags

math

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Instructional Ideas

• Post the videos in this series as review aids before a test

Classroom Considerations

• Expects a solid understanding of area and trigonometric ratios
• YouTube comments may contain inappropriate material

• This video is hosted on YouTube

Pros

• Includes visuals to accompany the algebraic steps
• Uses color coding to increase clarity

Cons

• None

Common Core

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