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.
Remove all the words that end with "ain"
Back to basics 25 - Valid variable names
Rotate input square matrix 90 degrees CCW without rot90
Volume of a box
Is it column vector?
Perimeter of a quadrilateral
Volume of Spherical Shell
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