(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I'm looking at some problems and solutions to them, and when they calculate shear stress instead of having the area of the thing be pi*r^2, there is usually a (pi/4)*r^2.

2. Relevant equations

Shear Stress = V/A

3. The attempt at a solution

I don't understand where they get the 1/4 in the denominator.

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# When calculating the shear stress, what should the area be?

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