17 . Slag left over from the manufacture of cement is being piled outside the cement plant. The resulting slag heap is a cone whose elements make an angle of 550 with the horizontal. a. Express the height h of the cone in terms of the radius r. 550 - b. Express the radius r in terms of the circumference c. C. Express the volume of the cone in terms of the circumference c. d. Environmentalists measure the circumference of the heap one day, finding it to be 1200 ft, and increasing at 27 ft/day. About how fast is the cement plant generating slag