Does anybody have the correct answer for Problem 9-84 in "Engineering...

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valgorithm

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...Mechanics Statics" by Hibbeler? I've already worked out my own solution, and I just want to compare my answer and verify that it is correct.

The problem reads as follows in the Eleventh Edition of R. C. Hibbeler's "Engineering Mechanics Statics" textbook:
"Determine the surface area and the volume of the ring formed by rotating the square about the vertical axis."

I arrived at the following answers:
A = 8?ab
V = 2?a²b

I'd greatly appreciate if you could either verify that this answer of mine is correct, or let me know that it is incorrect. This problem has been driving me crazy today!
 
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