A radius mathematical terms refers to half the distance from one endpoint of a circle to the opposite of a circle. If you know what a diameter is, the radius is one-half the diameter. (r=(1/2)*D).
paste this link in your address bar to get a picture of what a radius is.
http://paulgoddard.co.uk/tuition/resources/mathematics/geometry/circle_radius.gif
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Vol=(3.14)(radious squared)(height)+(4/3)(3.14)(radious cubed)
the ratio of the radious
You can't find the height of a cylinder if you know the radious, because the radious only determines how many units the circle is around. so it's impossible to find the height of a cylinder if you only know the radious.
Diameter, cord, radious.
About 408.41 inches.