Question 57
On the circumcircle of $A B C$, let $A'$ be the midpoint of arc $B C$ (not containing $A$).
a. Show that $A, I, A'$ are collinear.
b. Show that $A'$ is the circumcenter of $BIC$.
a. Show that $A, I, A'$ are collinear.
b. Show that $A'$ is the circumcenter of $BIC$.