you should ease up numerically on equality, so my solution works :)
The polar inertia is the sum of the squared distances of all points from the origin. https://en.wikipedia.org/wiki/Polar_moment_of_inertia
Extract leading non-zero digit
Back to basics 20 - singleton dimensions
Sum of diagonal of a square matrix
Magic is simple (for beginners)
Dick Van Dyck?
Distance walked 3D
given 3 sides, find area of this triangle
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