**ExplorationÂ **

A unit circle is a circle with a radius of 1, graphed on a Cartesian plane, with the center of the circle at the origin. The relationship between the angle of different radii on the circle and the values of different points on the circle can help in the understanding trigonometric functions.

**Objective**

In this exploration, students will:

1. Learn how to use the unit circle to graph trigonometric functions.

2. Use the PocketLabâ€™s accelerometer when attached to a rotating wheel to visualize how a sine function is graphed from the coordinates of a unit circle.

**Download PDF for complete lab activity**

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