Answer:
PR = 74°
Step-by-step explanation:
The secant- tangent angle PQR is half the difference of the intercepted arcs, that is
[tex]\frac{1}{2}[/tex] ( PS - PR ) = 50° (multiply both sides by 2 to clear the fraction )
PS - PR = 100°
174° - PR = 100° ( subtract 174° from both sides )
- PR = - 74° ( multiply both sides by - 1 )
PR = 74°
