Radius = Diameter/2
Diameter = 2* Radius
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divide diameter by 2
Radius is half of the diameter. So radius2 means rxr.
Calculating the radius of dish end size from the pressure vessel diameter is easy. All you have to do is add the blank radius by scaling the drawing from the side and you add five percent.
[2 x pie x radius] or [pie x diameter]
2,,r or ,,d 2x pi x radius or Pi x Diameter