This problem is looking for the number of vertices on the hexagonal grid inside the circle of radius r. The center of the hexagon is not counted as a point for this problem, and this is true for every hexagon inside the circle.
Which doors are open?
Find common elements in matrix rows
Convert a numerical matrix into a cell array of strings
The Answer to Life, the Universe, and Everything
Dots in a Sphere
Dots in a Circle
Volume of a Simplex
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