The area of Walpole Cross Keys is 4,030,000.0000000005 square meters.
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Volume = cross sectional area * lengthArea = 2* cross sectional area + perimeter of cross section * length
You could consider the cross as two intersecting rectangles. Calculate the area of both rectangles and the area of the intersection (overlap). Then area of cross = sum of the areas of the rectangles minus the area of the overlap.
Multiply the cross-section area by the height.
If the diameter doubles (x2), the cross-sectional area quadruples (x4).
Because the volume of the cylinder is proportional to the cross sectional area of the cylinder. The cross sectional area is a circle and the area of a circle is pi*r2.