Algebra Glossary - H
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half life:	The length of time it takes half of an amount of radioactive material to decay.
harmonic mean:	In a set of n numbers. n divided by the sum of the reciprocals of the number.
hyperbola:	The set of all points in it plane such that the absolute value of the difference of the distances (focal radii) from two given points (foci) is constant.
hypotenuse:	The longest side of a right triangle. It is opposite the right angle.

Note: The terms in this collection may not be entirely accurate.
They are for reference only.

half life: