A cylindrical metal pipe has a diameter of 20 millimeters and a height of 21 millimeters. A cylindrical hole cut out of the center has a radius of 6 millimeters. Which expressions represent the volume of metal needed, in cubic millimeters, to make the pipe? Check all that apply. 21π (10) 2 - 21π (6) 2 π (20) 2 (21) - π (6) 2 2,100π - 756π 7,644π
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