As a cone will always have a base which is a circle, the relationship between the diameter and radius remains constant with that of a circle at any point of the shape.
The radius is always 1/2 of the diameter.
To figure out the volume of a cone you must first work out the radius, for the formula is: (1/3) x Pi x R^2 x h
^2 = Squared
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Half of its diameter
The axis of a right circular cone is perpendicular to every radius or diameter of the base.
the formula is one thirdx pix radius squared
None, unless there is a relation between the semicircle and the cone that you have chosen not to share.
A cone has a base that is a circle. The radius of that circle is its radius.