The diameter of the internal measurement of the cylinder.
A mathematical cylinder only has one diameter.
A real world object that is a cylinder (e.g. a pipe) has a wall with a thickness and thus the internal and external diameters will differ by twice the thickness of the wall.
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If a cylinder's height is 7cm and its area is 659.73cm2, its diameter will be approximately 14.66cm
Consider going across the width of the pipe: Outer diameter = Thickness + Inner diameter + Thickness so 2*Thickness = Outer diameter - Inner diameter = 2.5 - 2.1 = 0.4 inches and therefore, Thickness = 0.2 inches.
The volume of a right circular cylinder with a diameter of 6.8 in and a height of 2 feet is: 871.6 cubic inches.
The volume of a cylinder if the diameter is 15mm and the height is 4.8 mm is 848.23 cubic mm
The volume of a 6' long cylinder with a diameter of 3" = 508.939 cubic inches. ((pi)r^2)L L = Length of the cylinder r=radius of the cylinder