Quarter-Tank Problem

p is the percentage of circle area,
r is the radius of the circle of which the segment is a part.
h is the height of the segment.

Math.PI r r p = (r r Math.acos((r - h) / r) - (r - h) Math.sqrt(2 r h - h * h))

I want to get Height(h)

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Level of liquid in the cylindrical tank, AKA Quarter-Tank Problem

This online calculator finds the height above the bottom of a horizontal cylinder (such as a cylindrical gas tank) to which the it must be filled for it to be full at specified percentage (for example, one quarter full amounts)

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PLANETCALC, Quarter-Tank Problem

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