A theorem named after this many tangent circles produces three concurrent lines.
A theorem named after this many tangent circles produces three concurrent lines. Aside from three, this is the only number of dimensions in which a vector cross product can be defined. This is the smallest positive number which cannot be represented as a sum of at most three squares, and there are this many (*) Millenium Prize Problems. This is the smallest number of sides a non-constructible regular polygon can have. The most likely-rolled sum of a pair of six-sided dice is, for ten points, what number of sides in a heptagon, the positive square root of 49?
A theorem named after this many tangent circles produces three concurrent lines.
{seven}