In three-dimensional space, a spherical shell can be constructed from two concentric spheres. Determine the volume of a spherical shell whose inner radius is r1 and outer radius is r2.
Swap the first and last columns
Back to basics 21 - Matrix replicating
Add two numbers
Please check if calorie intake is less than 300 kcal.
Calculating Ring Area
Perimeter of a quadrilateral
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