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.
Determine if input is odd
Extract leading non-zero digit
Number of Horns on a unicorn!
Doubling elements in a vector
find the surface area of a cube
Perimeter of a quadrilateral
Volume of Spherical Shell
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