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The radius is 1/2 the diameter. In other words, just divide the diameter by 2.
Area = pi*(diameter/2)2 = pi*252 = 1963.50 mm2
D = 50mm = 5cm Volume of sphere = Pi/6 x D3 = Pi/6 x 125 = 65.45 cubic centimetres (rounded).
MS Channel Weight: 100mm(length)*50mm(width)*5mm(thick)*.000785=19.625 Kg
Area = pi*252 = 1963.495 square mm to 3 decimal places