Question 1068287
Angles CAB and CBA are inscribed angles
that intercept arcs CA and CB.
Each of those angles measures half of
the measure of the intercept arc.
The sum of the measures of those angles
is half the sum of the measures
of the intercepted arcs CA and CB.
The sum of the measures of those arcs
Is the measure of arc AB,
regardless of the position of point C.