Unit circle

The unit circle is the circle around the origin of a coordinate system with radius $r=1r=1$. This means it represents the set of all points that have a distance of $11$ from the origin.

For example, the points

• $(1\mathrm{\mid }0)(1\; ~|~\; 0)$

• $(0\mathrm{\mid }1)(0\; ~|~\; 1)$

• $(-1\mathrm{\mid }0)(-1\; ~|~\; 0)$

• $(0\mathrm{\mid }-1)(0\; ~|~\; -1)$

are on the unit circle.