Brake line pressures

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From Wilwood's site on their master
CALCULATING EFFECTIVE PISTON BORE AREA TO DETERMINE PLUMBING
To determine the effective piston bore area of any caliper, you must first calculate the area for each piston bore found on one
side of the caliper. Use the formula " Area = (bore x bore) x .785" for each piston bore size. Then, add the areas of all pistons
on that one side of the caliper to determine the total effective piston bore area. Compare the difference between the front and
rear calipers and attach the line from the primary outlet "A" to the calipers at the end of the vehicle with the greater total
effective piston bore area.

So where do they get the .785? I though area sq in was pi(3.1416) x r x r with r being 1/2 bore



Their masters do have different volumes for the different ports so maybe that is the issue with mine.