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## Homework Statement

I read an e-book about the classical mechanics and didn't know how to find the lower and upper limits for a volume integral.

## Homework Equations

Perhaps, it may be related to the use of similar triangle.

## The Attempt at a Solution

I calculated the x value only (y is the same as x because of symmetry)

z/h = x/(a/2) = 2x/a

x = az/2h (distance)

Lower Limit = -az/2h

Upper Limit = az/2h

Can anyone tell me how to obtain the same values as the one given by the author?

Thank you very much!