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.
Knight's Tour Checker
Solve the Sudoku Row
Is X a Fibonacci Matrix?
Geometry: Find Circle given 3 Non-Colinear Points
NO _________ ALLOWED....
Volume of a Simplex
Dots in a Sphere
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