Category Archives: Geometry

Five Regular Solids, Part Three

Parts One and Two of this series of blogs established the following facts about solids that have F flat faces, E straight edges and V vertices. 1. The second fact concerns those solids that are regular. By regular we mean … Continue reading

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Five Regular Solids, Part Two

We have counted the number of faces (F), the number of vertices (V) and the number of edges (E) on five regular solids. These solids are regular because the number of edges bounding each face (m) is the same for … Continue reading

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All trig functions in one figure

Here’s a pretty thing that got completely missed in my grammar school mathematics class. We build a geometric diagram in which each trigonometric function corresponds to the length of a line. Remember the trigonometric functions? You’ll need them to appreciate … Continue reading

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