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.
Indexed Probability Table
surface of a spherical planet
Determine if a Given Number is a Triangle Number
Factorize THIS, buddy
Dots in a Diamond
Dots in a Sphere
Triangular Tiling Dots in a Circle
Chebyshev polynomials of the 1st Kind
Find the treasures in MATLAB Central and discover how the community can help you!
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
You can also select a web site from the following list:
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.
Contact your local office