TRIGONOMETRY GLOSSARY
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Title  Description  

Harmonic  A small integral multiple (or divisor) of a waveform is a harmonic. 

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

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. 

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

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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