I assume you are talking about a circle, and want the area. Dividing the diameter by 2 will give you the radius. Next, use the following formula:
A = pi x r2
(Area = pi x radius squared, where pi is about 3.14)
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A cylinder with a height of 10 inches and a diameter of 8 inches has a surface area of 351.86 square inches.
SA = ~314.159 square inches.
The area is 78.5 square inches.
No. A diameter is a length, which may be measured in feet. Square feet are used to measure areas. You cannot convert directly from linear measures to square measures.
V = volume of a cylinder = Pi*Diameter*depth 144 square inches = 1 square foot volume of each hole: Pi*10*4 ~= 125.7 square inches / 144 square inches/square foot = 0.8727 square feet We have 30 such holes so total volume = 30*0.8727 = 26.18 square feet.