Which of the following could be used to calculate the measure of ∠ROP?
a.(6x − 4)° + (2x + 16)° = 180°
b.(x + 16)° + (6x − 4)° = 360°
c.(6x − 4)° + (2x + 16)° = 360°
d.(x + 16)° + (6x − 4)° = 180°
![Which of the following could be used to calculate the measure of ROP a6x 4 2x 16 180 bx 16 6x 4 360 c6x 4 2x 16 360 dx 16 6x 4 180 class=](https://us-static.z-dn.net/files/dbf/5f4b96d58f465fbdd4681bdcfa75840d.gif)