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.
Find the sum of all the numbers of the input vector
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Replicate elements in vectors
Generate N equally spaced intervals between -L and L
Perimeter of a quadrilateral
Volume of Spherical Shell
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