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If the height is 9 and the volume is 21, then the radius = 0.8618

Q: What is the answer to radius 9 height 21 volume of cylinder?

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A cylinder with a radius of 21 inches and a height of 98 inches has a volume of 135,773.35 cubic inches. This cylinder would have a volume of 587.763 US gallons.

A cone, when radius is 4 and height is 21, has a volume of 351.86 units3

Volume = pi*r2*h = 21375 cubic ft (approx)

21

Total surface area = 628.3 square units.

Related questions

A cylinder with a radius of 21 inches and a height of 98 inches has a volume of 135,773.35 cubic inches. This cylinder would have a volume of 587.763 US gallons.

A cone, when radius is 4 and height is 21, has a volume of 351.86 units3

Volume = pi*r2*h = 21375 cubic ft (approx)

Volume = pi*182*21 = 21,375.396 cubic feet to 3 decimal places

21

3298.67 units2

The volume of this cylinder is approximately 3.41 cubic feet.

21

Total surface area = 628.3 square units.

The volume of a sphere with a radius of 21 units is: 12,348 units 3

Surface area of a cylinder without the end caps = 2*pi*10.5*21 square cm.

so a volume of a cylinder is V=3.14r2 X h.. you should be able to do it from there ;)