In two-dimensional space, a ring can be constructed by using two concentric circles. Determine the area of a ring which has r1 as the inner radius and r2 as the outer radius.
Back to basics 7 - Equal NaNs
Back to basics 23 - Triangular matrix
Replace multiples of 5 with NaN
Sum two matrices
Perimeter of a quadrilateral
Volume of Spherical Shell
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