This is the volume of a cylinder.
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a cone's volume>>> V = 1/3 [ (pi)*(radius*squared)*(height) ] so volume equals , (one third) of (pi) times (radius squared) times (height)
pi times 1/3 times the radius squared times the height
Use the formula: 2X3.14Xr2Xh + 2X3.14XrXh it may be confusing, because it is long 2 times pi time radius squared times height plus 2 times pi times radius times height.
[2 pi times (the radius squared)] plus [(2 pi times the radius) times the height] the parentheses are according to the order of operations
Area of a circle = (pi)r2 [Areacircle = pi time the radius squared.] Volume of a cylinder = (pi)r2h [Volumecylinder = pi times the radius squared times the height.] (This applies to a right circular cylinder. :)