# The Unit Circle

Drag the red point around the unit circle.

What is the radius of the circle?

## Look carefully at the x & y co-ordinate of the red dot as you move it around the circle.

What do you notice about the numbers?

## Compare the values of the x & y co-ordinate of the red dot with the values listed on the left hand side of the figure for Sine & Cosine.

What do you notice?

What are the coordinates of the red dot at ?