Answer:
x = 130
Step-by-step explanation:
The angle between a tangent and the radius of a circle = 90°, thus
∠ OAC = ∠ OBC = 90°
The sum of the interior angles of OACB = 360°
Subtract the sum of the known angles from 360 for x, that is
x = 360 - (90 + 90 + 50) = 360 - 230 = 130
