Answer:
see explanation
Step-by-step explanation:
An angle between a tangent and a chord is equal to the angle in the alternate segment.
(a)
x = 70°
(b)
x = 55°, y = 60°
(c)
x = 65°, y = 63°
z = 180° - (65 + 63)° ← angle sum in a triangle = 180°
z = 180° - 128° = 52°
