Activities

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Subject Area
- Maths: Precalculus: Trigonometry (Triangle and Circular Functions)
Author

Texas Instruments
Level

9-12
Activity Time

15 Minutes
Device
- TI-Nspire™
- TI-Nspire™ CAS
Software

TI-Nspire™
TI-Nspire™ CAS
TI-Nspire Version

1.7
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Application of the Unit Circle

Activity Overview

Students will use the unit circle and its relationship to the sine and cosine functions to solve a real-world application. Students will find the position of teeth around a 2-inch-diameter cogwheel using ordered pairs at specified degrees around the circle.

Key Steps

The diagram on page 1.6 shows the relationship between the unit circle and the sine function. The sine function can be used to represent the y-coordinate of point P for each angle. Students should notice that the highlighted leg in the triangles created in the unit circle is vertical.

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Teacher Files

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Author

Level

Activity Time

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TI-Nspire Version

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Application of the Unit Circle

Activity Overview

Key Steps

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