## Elementary Geometry for College Students (6th Edition)

$m\widehat {BC}=135^{\circ}$
If the $m\widehat {ACB}=270^{\circ}$, and point $C$ bisects arc $ACB$, then $m\widehat {BC}$ is half the $m\widehat {ACB}$ or $m\widehat {BC}=135^{\circ}$.