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Let a convex cyclic polygon be triangulated in any manner, and draw the incircle to each triangle so constructed. Then the sum of the inradii is a constant independent of the ...

An archaic name for topology.

An Andreini tessellation is a three-dimensional equivalent of a semiregular tessellation. There are 28 such tessellations.

A circle-preserving transformation composed of an odd number of inversions.

Two slant triangular prisms fused together.

"Brick" is an informal term for a cuboid.

The study of map projections and the making of geographical maps.

C=tauT+kappaB, where tau is the torsion, kappa is the curvature, T is the tangent vector, and B is the binormal vector.

A circle with an arrow indicating a direction.

Two lines that lie on top of one another are called coincident lines.