Seventh Grade

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Seventh Grade Math Vocabulary
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Acute Triangle
A triangle whose angles all measure less than 90
Examples
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Area of Complex Shapes
The number of square units needed to cover a
given surface Divide the shape into shapes whose
areas are easy to calculate and then add (or
subtract) to find the area of the given shape
Example
The area of the given shape is 1500 3000
4500 square units
1500
3000
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Area of Irregular shapes
The number of square units needed to cover a
given surface Count the number of whole square
units and combine partial square units together
to get a total area Examples
The area is approximately 32 units²
The area is approximately 10 units²
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Box Whisker Plot
A graph that shows how far apart and how evenly
data are distributed Example 68 is the median,
52 is the lower quartile, 87 is the upper
quartile
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Equiangular Triangle
A triangle with three congruent angles (and
also three congruent sides)
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Equilateral Triangle
A triangle with three congruent sides (and also
three congruent angles) Examples
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Exponent Notation
A number written with a base an
exponent Examples
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Exponent
The number that indicates how many times the
base is used as a factor Examples
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Inequalities (number line)
The graph of a mathematical sentence showing the
relationship between quantities that are not
equal, using lt, gt, lt, gt, or Examples
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Integer
The set of whole numbers and their
opposites Examples
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Isosceles Triangle
A triangle with (at least) two congruent sides
The two congruent sides are called legs The
third side is the base The angle formed by the
legs is the vertex angle Examples
Vertex angle
leg
leg
base
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Linear Equation
An equation that can be represented as a line
on the coordinate plane Examples

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Multi-step Equations
An equation where you have to do more than one
operation in order to find the solutions Examples

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Obtuse Triangle
A triangle containing exactly one obtuse
angle (an angle greater than 90 degrees)
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Opposite
Two numbers (represented by points on the number
line) that are the same distance from zero and
are on opposite sides of zero Examples
The opposite of 0 is 0
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Percents (above 100, below 1)
A percent is a ratio that compares a number to
100 Percent means per hundred Examples
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Pi (approximation)
The ratio of the circumference of a circle to
the length of
its diameter Examples
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Rational Numbers
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Regular Polygon
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Right Triangle
A triangle with exactly one right
angle Examples
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Scale Factor
The common ratio for pairs of corresponding
sides of similar figures The ratio used to
enlarge or reduce objects Examples
The scale factor is 2
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Scalene Triangle
A triangle with no congruent sides Its sides are
all different in length (Its angles are also all
different in size) Examples
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Scatter Plots
A graph of plotted points that attempts to show
a relationship (correlation) between two
variables Examples
This data shows a positive correlation As x
increases, so does y
This data shows a negative correlation As x
increases, y decreases
This data shows no correlation
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Similarity
Figures that have the same shape, but not
necessarily the same size Examples
Similar polygons have corresponding sides that
form equivalent ratios (proportions)
Similar polygons have congruent corresponding
angles