
Mathematical "M" Words magnitude of rotation In a rotation, the amount that the preimage is turned about the center of rotation, measured in degrees from 180 (clockwise) to 180 (counterclockwise), +/ m<POP', where P' is the image of P under the rotation and O is its center.
magnitude
of size transformation
In a size change, the factor by which the length of the preimage is changed,
A'B'/AB , where A' and B' are the images of A and B under the transformation.
Also called a size change factor or scale factor of size transformation.
magnitude of translation The distance between any point and its image. major arc
AB of circle O The
points of circle O that are on or in the exterior of angle AOB.
mapping An operation on a geometric figure by which each point gives rise to a unique image. A correspondence between two sets of points such that each point in the preimage set has a unique image, and each point in the image set has exactly one preimage. Also called a transformation. matrix
A rectangular array of rows and columns. mean A number that describes a set of other numbers. You get a mean, or average, as it is commonly called, by taking the sum of the numbers being examined and then dividing that sum by how many numbers were added. For example: To find
the mean, or average, of 10, 9, 8, and 5 this is what you would do: means
In the proportion
a/b = c/d, the numbers b and c.
meansextremes
property
In any proportion, the product of the means equals the product of the
extremes. Some people learn this as "cross products are equal
in any proportion." measure The dimension or amount of something, usually in a system of units. medial triangle
The union of segments that join the midpoints of the sides of a triangle. median of
a triangle The
segment connecting a vertex of the triangle to the midpoint of the opposite
side.
menu A list of options from which a user of a computer can select an operation for the computer to perform. Mercator projection A two dimensional map of the Earth's surface named for Gerhardus Mercator, the Flemish cartographer who first created it in 1569. meter
The basic unit of length in the metric system. metric system of measurement A system of measurement based on the decimal system. Also called the international system of measurement. midpoint
of a segment The
point on the segment equidistant from the segment's endpoints. mile ( mi ) A unit of length in the US system of measurement equal to 5,280 feet. 1 mile 1.609 km. milli A prefix meaning 1/1000. million A word name for 1,000,000. millionth A word name for 0.000001 or 10^{6}. minor arc
AB of circle O
The points of circle O that are on or in the interior of angle
AOB. minuend The number a in a  b. mirror A line over which a figure is reflected. Also called reflecting line. mixed numeral A symbol consisting of a whole number with a fraction next to it, when written like this it means the numbers are being added. mixed number A number written as a mixed numeral. mode The number which appears most often in a data set. The mode of the following data set is 6 : 15, 6, 2, 6, 42, 6. It is possible to have more than one mode as in the set 1, 1, 3, 12, 4, 4. It is possible to have no mode if no values appear more than once as in the set 1, 2, 3, 4. Multiplication
of Fractions Property for
all numbers a, b, c, and f with b and f
not equal to 0:
Multiplication
Property of Equation
For all real nos. x, y and a, Multiplication Property of 1 For any real number x: 1 times x = x. Multiplication Property of Zero For any real number x: x times 0 = 0. Multiplicative
Identity Property of One
For any number
n: multiplicative inverse The number by which a given number can be multiplied resulting in a product equal to 1. Also called reciprocal. MultRec Property of Division For any numbers a, and b, with b not equal to 0: a/b = a times 1/b. In words, to divide by a number is the same as multiplying by its reciprocal.
