
Stewart M.
asked 07/08/23Assume that the height of your cylinder is 6 inches. Consider A as a function of r, so we can write that as A(r)=2πr2+12πr. What is the domain of A(r)?
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1 Expert Answer
Richard C. answered 07/08/23
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Confidence-building Pre-Calculus tutor with 18 years experience
There is no such thing as a negative radius, so the domain would be [0, ∞) .

Dayv O.
agree, r=0 is degenerate case when surface area of line segment length=6 inches is zero. All r>0 create non-zero surface area.
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07/09/23
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Mark M.
As written the domain of A(r), all values of r that are meaningful, is all real numbers greater than zero. Additional constraints?07/08/23