GEOMETRY GLOSSARY
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Title  Description  

Heading  Quite similar to bearing, Heading is a dynamic direction that implies motion. 

Height  Altitude. How tall something is, measured in some perpendicular fashion to the "bottom" is its height. 

Helix  A straight line wrapped around a circular cylinder at some angle not perpendicular to the base of the cylinder results in a Helix. 

Heptagon  A sevensided polygon is a Heptagon; also called a septagon. 

Heron's Formula  A wonderful little recipe (algorithm) for finding the area of a triangle when sides are known and the altitude is not known, the formula is best expressed with a semiperimeter. 

Hexahedron  A sixfaced polyhedron is termed a Hexahedron. 

Horizontal  Horizontal comes from orientation like the horizon; parallel to the "flat" surface of the earth; perpendicular to vertical. 

Hyperbola  A conic section of specific mathematical relation to foci; its shape is the intersection of a double cone with a plane. The difference between distances from a locus on the Hyperbola to the two foci is a constant. 

Hyperbolic Geometry  Hyperbolic Geometry is nonEuclidean geometry; within it the Parallel Postulate does not hold. 

Hypotenuse  The longest side of a right triangle is the Hypotenuse; it is always opposite the 90degree angle (or right vertex). 

Hypothesis  In a biconditional statement the hypothesis is followed by a conclusion. In the scientific method, the hypothesis is the conjecture to be proved or disproved. 
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