Interactive math tool
Unit Circle: sin, cos, tan Visualizer
Drag an angle on the unit circle to see (cos θ, sin θ) and tan θ — ideal for introducing trigonometry.
The unit circle links angles to coordinates: the terminal point is cosine and sine. Dragging beats memorizing alone.
How it works
- Open the unit-circle scene.
- Drag the angle slider.
- Read cos, sin, and tan.
- Check that sin²θ + cos²θ = 1.
Classroom tip
Start in quadrant I, then move to quadrant II to see positive sine and negative cosine.
FAQ
Do students need radians first?
Degrees work fine for intuition; radians appear alongside.
Is this tool free?
Yes. It runs in the browser with no install.
Good for class demos?
Yes — project it and ask what changes when you drag a parameter.
How do I write the formula afterward?
Open the equation editor or symbol sheet and copy a clean expression.