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FOA flash card
FOA flash cards
34
Mathematics
9th Grade
03/20/2025

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Term
absolute value
Definition
The distance of a number from zero; the positive value of a number.
Term
acute angle
Definition
A positive angle measuring less than 90 degrees.
Term
acute triangle
Definition
A triangle each of whose angles measures less than 90 degrees.
Term
additive identity
Definition
The number zero is called the additive identity because the sum of zero and any number is that
number.
Term
additive inverse
Definition
The additive inverse of any number x is the number that gives zero when added to x. The additive
inverse of 5 is -5.
Term
angle
Definition
The union of two rays with a common endpoint, called the vertex.
Term
arc
Definition
A portion of the circumference of a circle.
Term
area
Definition
The number of square units that covers a shape or figure
Term
associative property of addition
Definition
(a + b) + c = a + (b + c)
Term
associative property of multiplication
Definition
(a x b) x c = a x (b x c)
Term
average
Definition
A number that represents the characteristics of a data set.
Term
axis of symmetry
Definition
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.
Term
base
Definition
The bottom of a plane figure or three-dimensional figure.
Term
Bisect
Definition
To divide into two congruent parts.
Term
Box and whisker plot
Definition
A type of data plot that displays the quartiles and range of a data set.
Term
Cartesian coordinates
Definition
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.
Term
central angle
Definition
An angle that has its vertex at the center of a circle.
Term
absolute value
Definition
The distance of a number from zero; the positive value of a number.
Term
acute angle
Definition
A positive angle measuring less than 90 degrees.
Term
acute triangle
Definition
A triangle each of whose angles measures less than 90 degrees.
Term
additive identity
Definition
The number zero is called the additive identity because the sum of zero and any number is that
number.
Term
additive inverse
Definition
The additive inverse of any number x is the number that gives zero when added to x. The additive
inverse of 5 is -5.
Term
angle
Definition
The union of two rays with a common endpoint, called the vertex.
Term
arc
Definition
A portion of the circumference of a circle.
Term
area
Definition
The number of square units that covers a shape or figure
Term
associative property of addition
Definition
(a + b) + c = a + (b + c)
Term
associative property of multiplication
Definition
(a x b) x c = a x (b x c)
Term
average
Definition
A number that represents the characteristics of a data set.
Term
axis of symmetry
Definition
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.
Term
base
Definition
The bottom of a plane figure or three-dimensional figure.
Term
Bisect
Definition
To divide into two congruent parts.
Term
Box and whisker plot
Definition
A type of data plot that displays the quartiles and range of a data set.
Term
Cartesian coordinates
Definition
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.
Term
central angle
Definition
An angle that has its vertex at the center of a circle.
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