Determine the volume of a cylinder with a diameter of 9 inches and a height of 7 inches.
(A) 445.095 cubic inches
(B) 315 cubic inches
(C) 197.82 cubic inches
(D) 63 cubic inches
(E) 16 cubic inches
What’s the formula for the volume of a cylinder? Well, if you think about it, a cylinder is really a circle with height. So all you have to do is use the formula for the area of a circle, which is p · radius2, and then multiply it by the height of the cylinder. With that we get 4.5 x 4.5 x π x 7. The way the choices are expressed, we know that we have to use the numerical value of π, or 3.14. Multiplying all of that out, we get 445.095. The answer is (A).
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