N I O I P I Q I R I S I T I U I V I W I X I Y I Z

**A**I B I C I D I E I F I G I H I I I J I K I L I MN I O I P I Q I R I S I T I U I V I W I X I Y I Z

## A

A positive angle measuring less than 90° .

A triangle with all angles measuring less than 90° .

A number which is involved in addition. Numbers being added are considered to be the addends.

Calculating a sum by adding two or more numbers.

Two angles that share both a side and a vertex.

A branch of mathematics in which variables are substituted for unknown values to solve a particular problem.

A step-by-step procedure for carrying out computation.

Two angles that are in opposite locations when lines are cut by a transversal.

Length from the uppermost point of a triangle to the line opposite.

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

Estimate.

A portion of the circumference of a circle.

The number of square units covering a shape or figure.

Method of computing using addition, subtraction, multiplication, or division.

A set of numbers that will follow a specific pattern. An orderly arrangement often in rows, columns or a matrix.

When performing an operation on three or more numbers, the result is unchanged by the way the numbers are grouped.

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A characteristic to describe an object usually within a pattern. The attribute usually refers to the shape, size, or color.

A number that represents the characteristics of a data set, calculated by adding a group of numbers then dividing by the number of elements in that group.

The horizontal and vertical lines that form the quadrants of the coordinate plane. The horizontal axis is usually called the x-axis, the vertical axis is usually called the y-axis.

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.

**acute angle**A positive angle measuring less than 90° .

**acute triangle**A triangle with all angles measuring less than 90° .

**addend**A number which is involved in addition. Numbers being added are considered to be the addends.

**addition**Calculating a sum by adding two or more numbers.

**adjacent angles**Two angles that share both a side and a vertex.

**algebra**A branch of mathematics in which variables are substituted for unknown values to solve a particular problem.

**algorithm**A step-by-step procedure for carrying out computation.

**alternate angles**Two angles that are in opposite locations when lines are cut by a transversal.

**altitude**Length from the uppermost point of a triangle to the line opposite.

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

**approximate**Estimate.

**arc**A portion of the circumference of a circle.

**area**The number of square units covering a shape or figure.

**arithmetic**Method of computing using addition, subtraction, multiplication, or division.

**array**A set of numbers that will follow a specific pattern. An orderly arrangement often in rows, columns or a matrix.

**associative property**When performing an operation on three or more numbers, the result is unchanged by the way the numbers are grouped.

**associative property of addition**(

*a*+*b*) +*c*=*a*+ (*b*+*c*)**associative property of multiplication**(

*a*⋅*b*) ⋅*c*=*a*⋅ (*b*⋅*c*)**attribute**A characteristic to describe an object usually within a pattern. The attribute usually refers to the shape, size, or color.

**average**A number that represents the characteristics of a data set, calculated by adding a group of numbers then dividing by the number of elements in that group.

**axis**The horizontal and vertical lines that form the quadrants of the coordinate plane. The horizontal axis is usually called the x-axis, the vertical axis is usually called the y-axis.

**axis of symmetry**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.