You cut an ellipsoid with a plane perpendicular to one of its axes at a position where the cross section is a 21 unit circle. Either section will make a dome - one will taper off while the other will bulge before it tapers.
The area of the base is 12.6
The volume of this cylinder is approximately 3.41 cubic feet.
Its just the area of a circle 21 inches or 21 centimeters? area of a circle is (pi)*r2 where pi = 3.1415.... and r = radius thus A = (3.1415)*(diameter/2)2 u can figure out the answer from that with a calculator
6,084*pi cubic feet or about 21,364.56 cubic feet.
The circumference of a circle that has a diameter of 21 is about 65.97
Assuming the dimensions given are inside dimensions, the cylinder will hold 55.75 gallons - less if the dimensions given are outside dimensions.
Its diameter is: 21/pi = 6.685 inches rounded
If a circle has a diameter of 21 feet the circumference is: 65.97 feet (diameter x Pi = circumference).
Volume of a cylinder is calculated by V = pi x r-squared = h, therefore the volume is approximately 168.9 cubic metres
The diameter is approximately 6.7
so a volume of a cylinder is V=3.14r2 X h.. you should be able to do it from there ;)
Diameter of circle: 21/pi = 6.685 units rounded to 3 decimal places