What is the magnitude of the central angle when the magnitude of the corresponding inscribed angle is

a) [[$ 30° $]]?



Answer: The magnitude of the central angle is [[$ ° $]].

b) [[$ 75° $]]



Answer: The magnitude of the central angle is [[$ ° $]].

c) [[$ 120° $]]



Answer: The magnitude of the central angle is [[$ ° $]].

d) [[$ 3x $]]?



Answer: The magnitude of the central angle is .