GEOMETRY GLOSSARY
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Title  Description  

Face, Geometry  Solids, in geometry, are considered to have faces when lateral sides are flat, that is, planar.  
Foci  Certain points in conic sections (and other geometric entities) are termed Foci, the plural of focus. They are important to the mathematical mechanics of the functions. 

Focus  A specific point in a conic section (or other geometric entity) is termed a Focus, the singular form of the word foci. They are important to the mathematical mechanics of the functions. 

Formula  A recipe or algorithm for calculation, evaluation, simplification, or just about anything we do in mathematics can be called a Formula.  
Fractal  Certain shapes maintain their shape through all permutations of multiplication, growth, dilation, division, contraction, or shrinkage. Such shapes are Fractals. 

Frustum  Slice a pyramid (or cone) parallel to its base, remove the top. What remains under the "missing top" is the Frustum. 
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