Answer:
If a circles angle are 360 then you add 130 and 150 then subtract from 360 getting the answer of 80
∠ 1 = 40°
Step-by-step explanation:
The sum of the angles making up the circumference = 360°
measure of lower arc = 360° - (150 + 130)° = 360° - 280° = 80°
∠ 1 is half the measure of the intercepted arc, that is
∠ 1 = 0.5 × 80° = 40°
