2 points $A$ and $B$ on a [[Circle]] $C$ will split the circle into 2 portions, the **_minor_ arc** $\overparen{AB\ }$being the smaller one. Another point $D$ not on $\overparen{AB\ }$can be used to name the **_major_ arc** $\overparen{ADB\ }$ If the 2 portions are equal, they are [[‡ Semicircle|semicircles]]