In the diagram below, AB is tangent to the circle. If the measure of arc QR = 100 and the measure of arc PR = 190, what is angle measure A?
A 85
B 90
C 30
D 45
E 15
![In the diagram below AB is tangent to the circle If the measure of arc QR 100 and the measure of arc PR 190 what is angle measure A A 85 B 90 C 30 D 45 E 15 class=](https://us-static.z-dn.net/files/dff/d8cf882bd7843f20c7bb2a1667462bf5.png)