# 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 seven-sided 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 six-faced 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 non-Euclidean 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 90-degree 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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