Bore x 2 does not equal Bore x Bore
Ex Bore = 4 inches = diameter of cylindere
4 inches x 2 = 8 inches
4 inches x 4 inches = 16 square inches
Area of circle = pi x R x R or in terms of diameter = D x D x pi/4
R = radius
D = diameter
pi = 3.14 .........
pi/4 = 0,7854 .....
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