The distance of a number from zero; the positive value of a number.

ex: [image]

A positive angle measuring less than 90 degrees

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 [image]

A triangle each of whose angles measures less than 90 degrees.

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 [image]

The number zero is called the additive identity because the sum of zero and any number is that

number. 

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 [image]

The additive inverse of any number x is the number that gives zero when added to x. The additive

inverse of 5 is -5.

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 [image]

Two angles that share both a side and a vertex.

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[image]

The union of two rays with a common endpoint, called the vertex.

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[image]

A portion of the circumference of a circle.

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[image]

The number of square units that covers a shape or figure.

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[image]

(a + b) + c = a + (b + c)

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[image]

(a x b) x c = a x (b x c)

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[image]

A number that represents the characteristics of a data set.

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[image]

A line that passes through a figure in such a way that the part of the figure on one side of the line

is a mirror reflection of the part on the other side of the line.

ex: 

[image]

The bottom of a plane figure or three-dimensional figure.

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[image]

To divide into two congruent parts.

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[image]

A type of data plot that displays the quartiles and range of a data set.

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[image]

A system in which points on a plane are identified by an ordered pair of numbers, representing the distances to two or three perpendicular axes. 

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[image]

An angle that has its vertex at the center of a circle.

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[image]

A line segment that connects two points on a curve.

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[image]

The set of points in a plane that are a fixed distance from a given point, called the center.

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         [image]                kl

The distance around a circle.  

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[image]

A constant that multiplies a variable.  

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[image]

Points are collinear if they lie on the same line. 

Ex: 

[image]

A selection in which order is not important.

Ex: 

[image]