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You cannot have a trapezoidal cylinder. That is like a square circle - an impossible shape.
The volume is Base x height; the Base area is the same as the formula for a circle - which is proportional to the square of the radius. For example, if you double the radius (or the diameter, or the circumference) of a circle, its area will quadruple.
With great difficulty because a circle does not have volume but it does have an area. Area of a circle = pi*radius2 and measured in square units
The formula of volume
If you are given the radius of the circle, you can use the formula: diameter = 2*radius If you are given the circumference of the circle, you can use the formula: diameter = circumference/pi