What is the value of r in the unit circle?

In the context of the unit circle, the value of ( r ) represents the radius of the circle. The unit circle is defined as a circle with a radius of 1 unit centered at the origin (0, 0) in the Cartesian coordinate system. This means that regardless of the angle, any point on the unit circle is at a distance of 1 unit from the origin.

Therefore, the value of ( r ) in the unit circle is 1. This fundamental property of the unit circle is crucial for many applications in trigonometry and geometry, as it provides a standard reference for understanding angles, sine, cosine, and other trigonometric functions.