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.
Times 3 problem
Create sequnce 1 4 9 16 25.........
Given a square and a circle, please decide whether the square covers more area.
Calculating Ring Area
Perimeter of a quadrilateral
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