Unit Circle

The unit circle is a circle with a radius of one centered at the origin of a coordinate plane. It helps visualize angles and their corresponding sine and cosine values. When you measure an angle from the positive x-axis, the point where the angle intersects the circle shows the cosine value as its x-coordinate and the sine value as its y-coordinate. This circle is fundamental in trigonometry, linking angles to points on a circle, and is used to understand wave patterns, rotations, and oscillations in various fields like physics and engineering.