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πr^2?
engineers use d²π/4 as you can't measure the radius of a pipe or a similar 3d solid object only diameter.
or engineers are not smart enough to calculate r=d/2 first
Why would i calculate r? I need only the area. See? Why would I waste my time for an extra calculation.
Just do it in your head? The diameter is 5.62, so the area is π*2.81², which is more efficient to type in your calculator than π*5.62²/4. You're the one wasting time.
Life is too short to waste for such things.
This actually explains some of the formulas in research papers I've read.
No its actually r^2π
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