# GEOMETRY GLOSSARY

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Title Description
Magnitude, Powers of Ten Often when we compare the multiplication by various powers of ten we speak of the magnitude of the effect of the multiplication.
Major Axis Certain conic sections have a Major Axis, a line (segment) between vertices.
Measure A noun or verb, Measure implies comparison to an established standard.
Measurement The result from comparison to an established standard, Measurement may be exact only to an agreed-to precision.
Median, Trapezoid The average of the lengths of the bases of a trapezoid.
The Median is a line segment parallel to and equidistant from the bases.
Median, Triangle A triangle has three Medians, each a line segment from a vertex to the midpoint of the opposite side of the triangle.
Medians are concurrent at the centroid.
Midpoint Every line segment (or side of a polygon) contains a point equidistant from the endpoints (or vertices), the Midpoint.
Minimize A process to establish the least extent, value, or size possible.
Minor Axis A line or line segment specific to certain conic sections.
Minute, Angle For angles, one Minute is one-sixtieth of a degree.
One Minute is equivalent to 1/21600 of a circular rotation.
Mode While Mode can take on several meanings in mathematics, it generally is used for the value of data with the greatest frequency of occurrence in a list of values.
Modus Ponens We have "If A, then B." Modus Ponens is a piece of logic that goes like this: if we know A to be true, then we know that B must be true, too.
Modus Tollens Begin with "If A, then B." That's a given.
We (somehow) know that B is false.
We then may infer (but not conclude) that A is false.
Modus Tollens is not particularly robust; it is not entirely dependable.
Multiplicative Inverse Another name for Multiplicative Inverse is reciprocal.
Reciprocals multiply to one.

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