Answer:
30. 35
31. 133
Step-by-step explanation:
For 30, in a circle, the measure of an inscribed angle is half the measure of the central angle with the same intercepted arc. Basically, the angle of arc FR from the center would be 70 degrees, so the angle FNR would be half of this, which is 35 degrees.
For 31, you take the angles formed by the two arcs made by the exterior angle and you take the average. So in this case, (88 + 178)/2 = 133.
