This Understand Quandrantal Angles by Examining X and Y Values Near Them video also includes:
Building off reference triangles, pupils discover that when theta is a multiple of 90º, the coordinates are a combination of 0 or 1. The examples use a regular reference triangle, and increases the value of theta each time to show how the coordinates creep closer to (0,1); even though there can't be a triangle with a side of 0.
- Use the other videos in the series for more video lessons regarding the unit circle and trigonometric functions
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- Explains why the sine and cosine values of 90º values of theta are 0 or 1
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