Finding trigonometric ratios is relatively easy; you just have to know where to look. The first installment of a 16-part video playlist shows how to find the sine, cosine, and tangent values for a given angle. It shows how to find the values from a table and by using a calculator.

Concepts

trigonometric ratios, sine, cosine, tangent

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Additional Tags

math

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Instructional Ideas

• Provide some exercise problems for the class to complete

Classroom Considerations

• Note that the video refers to 0 as naught
• Calculator shown in the resource is a scientific calculator; be sure learners can find trig values on their own calculators

• This video is hosted on YouTube

Pros

• Clear step-by-step explanations make it easy for students of all levels to understand

Cons

• Does not teach what trigonometric ratios mean

Common Core

SL.9-10.2 SL.11-12.2 HSG-SRT.C.6