What is the measure of angle R?
Choices:
A. 68
B. 73
C. 63
D. Cannot be determined
![What is the measure of angle R Choices A 68 B 73 C 63 D Cannot be determined class=](https://us-static.z-dn.net/files/d51/8b2535b99242d13bc8e067b92b33feb1.png)