Word | Definition | Examples | |
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Half-life | The amount of time required for a quantity to fall to half its value as measured at the beginning of the time period.
The time taken for the radioactivity of a specified isotope to fall to half its original value. |
This term is frequently used in problems with exponential decay. | |

Half-plane | One half of a plane On a plane that is divided by a line, each side of the line is a half-plane, |
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Hemisphere | One half of a sphere On the globe, the northern hemisphere is the top half of the world. |
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Histogram | A bar graph that shows the frequency of data in intervals of equal size.
The height of each bar shows the number of items in each interval |
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Hyperbola | A set of points that are equidistant from a foci. The graph looks a lot like two parabolas on their side. |
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Hypotenuse | In a right triangle, the side opposite the right angle - the longest side in a right triangle | ||

Hypothesis | In a conditional statement (if _ then_), the statement that immediately follows the if. |
The assumption you start with |

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Last Updated: 6/26/2014*

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