Circle in which the radius is equal to 1 unit.

Synonym for

**trigonometric circle**.### Property

Because the radius of a unit circle is 1, its circumference is equal to \(2π\) and its area is equal to \(π\).

Circle in which the radius is equal to 1 unit.

Synonym for **trigonometric circle**.

Because the radius of a unit circle is 1, its circumference is equal to \(2π\) and its area is equal to \(π\).