Answer:
61.5°
Step-by-step explanation:
The triangle is isosceles , the radii are congruent , then the 2 base angles are congruent.
The vertex = 360° - 303° = 57
shaded angle = [tex]\frac{180-57}{2}[/tex] = [tex]\frac{123}{2}[/tex] = 61.5°
