Respuesta :

mhanifa

Answer:

  • 27°

Step-by-step explanation:

Since the largest triangle is right triangle, the vertical segment is the perpendicular bisector of right angle with vertex at the center of circle.

Then we have

  • m∠R + 18° = 90°/2
  • m∠R + 18° = 45°
  • m∠R = 45° - 18°
  • m∠R = 27°