Take ratios of sides to a new level. Pupils learn the definitions of the three basic trigonometric ratios in right triangles. Using the definitions, scholars find missing lengths in right triangles, based on a known angle. Individuals then work several problems to become more familiar with the trigonometric ratios.

Concepts

trigonometric ratios, trigonometric word problems, trigonometry applications, cosine, sine, tangent

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Instructional Ideas

• Have the class determine trig ratios for congruent angles to see they are the same independent of the size of the triangle
• Ask classmates to come up with a unique method to remember the trigonometric ratios

Classroom Considerations

• Installment four in a six-part unit covering right triangles

• This video is hosted on YouTube

Pros

• Worksheet packet has a section devoted to note-taking during the video
• Contains two worksheets to provide additional practice when needed

Cons

• There are approximately five minutes of the video presentation that repeats itself

Common Core

SL.9-10.2 SL.11-12.2 MP6 MP7 MP8 HSG-SRT.C.6