The diameter of a cylinder is not related to its height. A cylinder with a diameter of 8 can have any height. Also, don't measure geometric figures without using a unit of measurement. A diameter is 8 something, it could be 8 centimeters, 8 inches, 8 miles, and so forth, it is not just 8.
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A cylinder with a radius of 6 inches and a height of 8 inches has a volume of 904.78 cubic inches.
Of course the diameter of a cylinder with a diameter of 8 cm is 8 cm, but I suspect you were asking about volume or surface area.First, the measurements should be converted to the same units. Since there are 2.54 centimeters per inch, the cylinder has a diameter of 8 cm and a height of 12.7 centimeters.The volume of a cylinder is pi * (1/2 d)^2 * h, so the volume of cylinder with diameter 8 cm and height 5 inches is pi * 16 * 12.7 = 997.46 cubic centimeters.The surface area of a cylinder is (2*pi*r*h) + (2*pi*r^2) = (in our case) 556.06 square centimeters.
207.2
The volume is 628.32 cubic inches.
40pi or about 125.6