Question

What is a Unit Circle?

Answer 1

A unit circle is a circle of unit radius, i.e., of radius 1. The unit circle plays a significant role in a number of different areas of mathematics. For example, the functions of trigonometry are most simply defined using the unit circle.

Explanation:

Answer 2

The "Unit Circle" is a circle with a radius of 1.

The center is put on a graph where the x axis and y axis cross, so we get this neat arrangement here.

The graph is given by: