Quadrilateral OPQR is inscribed in circle N, as shown below. Which of the following could be used to calculate the measure of <QRO?
0
/(x+16)
N
(2x+16)°
P
(6x-4)
R
o
Om-QPO + (x + 16)° + (6x - 4)° = 360°
O m QPO = (x + 16)° + (6x - 4)°
Om-OPO + (2x + 16)° = 180°
Om OPO = (6x - 4)° + (2x + 16)°