Explorations in Math and Code

This is a demonstration of the sine function. Remember that $\sin (\theta )$ is defined to be the $y\text{-value}$ of the point on the unit circle defined by angle $\theta$, measured counter-clockwise from the $x\text{-axis}$. Here’s another way to think of it: $\sin \theta$ is the projection of the clock hand on the $y\text{-axis}$.

Click on graph to activate, then use arrow keys.