I don't understand how to get the answer please help?

What percent of the circle below is shaded?

Write a fraction less than 1, which has a denominator of 6 and is greater than 3/4 plz answer !

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min