In the figure below, \angle ABC∠ABCangle, A, B, C is inscribed in circle PPP. The length of \overline{PC}
PC
start overline, P, C, end overline is 121212 units. The arc length of \stackrel{\LARGE{\frown}}{AC}
AC
⌢
A, C, start superscript, \frown, end superscript is \dfrac{68}{15}\pi
15
68

πstart fraction, 68, divided by, 15, end fraction, pi.

What is the measure of \angle ABC∠ABCangle, A, B, C in degrees?