Definition:Minor Arc

Definition
Let $a$ and $b$ be points on the boundary $\BB$ of a simple closed curve $\CC$ in the plane.

Let $a$ and $b$ divide $\BB$ into unequal parts.

The shorter of the arcs described by $a$ and $b$ is referred to as the minor arc of $\BB$.

Minor Arc of Circle

 * Circle.png

Also see

 * Definition:Major Arc