Answer: [tex]126^{\circ}[/tex]
Step-by-step explanation:
If we draw RP and PS, then in the quadrilateral formed, we know that [tex]\angle PRQ=\angle PSQ=90^{\circ}[/tex], and since angles in a quadrilateral add to 360 degrees, this means [tex]\angle SPR=126^{\circ}[/tex].
Thus, arc RS also measures 126 degrees
