What trig function do you use to find x

What percent of the circle below is shaded?

The cone in the diagram has the same height and base area as the prism. what is the ratio of the volume of the come to the volume of the prism? base area=b base area =b volume of cone volume of prism 1 2 volume of cone volume of prism 1 3 volume of cone volume of prism 2 3 2019 edmentum. all rights reserved us - 12: 00 dit

Sound travels about 750 miles per hour. a) suppose it takes about 1.5 seconds to hear the echo. how far away is the canyon wall, in feet? for this i got 825 ft b) suppose you stand 1,925 feet from the canyon wall and sound the horn. how long will it take to hear the echo? (i'm stuck on this)