# Math

 Shapes Formula Rectangle: Area = Length X Width A = lw Perimeter = 2 X Lengths + 2 X Widths P = 2l + 2w Parallelogram Area = Base X Height a = bh Triangle Area = 1/2 of the base X the height a = 1/2 bh Perimeter = a + b + c (add the length of the three sides)

### Math Vocabulary

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

acute angle
A positive angle measuring less than 90 degrees.

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

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

Two angles that share both a side and a vertex.

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

arc
A portion of the circumference of a circle.

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

average
A number that represents the characteristics of a data set.

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.

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

Bisect
To divide into two congruent parts.

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

Cartesian coordinates
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.

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

circumference
The distance around a circle.

coefficient
A constant that multiplies a variable.

common multiple
A multiple of two or more numbers

commutative property of multiplication
a*b = b*a.

congruent
Figures or angles that have the same size and shape.

coordinate plane
The plane determined by a horizontal number line, called the x-axis, and a vertical  number line, called the y-axis, intersecting at a point called the origin. Each  point in the coordinate plane can be specified by an ordered pair of numbers.

cylinder
A three-dimensional figure having two parallel bases that are congruent circles.

data
Information that is gathered.

dependent events
Two events in which the outcome of the second is influenced by the outcome of  the first.

difference
The result of subtracting two numbers.