Your answer is 6.643 kg
Because 1 gram is equal to 0.001 kilograms, 0.001 kg x 6,643 g = 6.643 kg
Hope this helps!
The cylinder is symmetric across the plane

, so we need only consider half of the cut-out region.
This region can be parameterized by

with

and

. Then the area of this half is given by the surface integral



Doubling this gives a total area of 72.
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