Identify the interval that is not equal to the other three. explain your reasoning

What percent of the circle below is shaded?

Me. i can't figure out this question. give an explanation too. .

The domain of a function can be represented by which one of the following options? o a. a set of output values o b. a set of f(x) values o c. a set of input values o d. a set of both input and output values