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.
Find the two most distant points
surface of a spherical planet
peta to nano (x-ray)
Is it an Armstrong number?
Is this triangle right-angled?
Shifted Hexagonal Tiling Dots in a Circle
Dots in a Diamond
Dots in a Circle
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