Question

if O is the center of the circle, then find x in each of the following figures.

Answer 1

First one is 22.5 degrees. Half of 45(angle by chord CB at centre and circumference theorem).

Second one is 50 degrees.

Third one is 60.

Fourth is not clear, but if given value is 60, then x is 240.

Fifth one is 140.

Sixth not clear.. angle looks like infinity. hAha.

Seventh is 60.

8th is 100. 9th looks wrong because how can O be its centre. But still it could be 82.

And last is 80 degrees.