Answer: 82
Explanation
Arc RPA is a semicircle since it's half the circle. Notice how the endpoints of diameter RA are the endpoints of this arc.
Any semicircle will have angle measure 180 degrees.
(arcRP) + (arcPA) = arc RPA
98 + x = 180
x = 180-98
x = 82
Minor arc PA is 82 degrees. This is the measure of central angle POA, aka angle 5. This is because the central angle is equal to the arc measure it subtends.
