Use p 314. The formula for the volume of a cone is 13TTr2h 1322711511021 5238 round up to 524. If you do not know it you can find the side length s using the radius r and the cones height h.
A cone has a radius r and a height h see picture below.
Use the aria of the elliptical section rather of base aria and use the gap from tip to the plane of the section rather of top. To calculate its volume you need to multiply the base area area of a circle. A cone has a radius r and a height h see picture below. Since the base is a circle area of the base p r 2.