seventh grade math vocabulary. acute triangle a triangle whose angles all measure less than 90°...
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Seventh Grade Math Vocabulary
Acute TriangleA triangle whose angles all measure less than
90°
Examples
Golden acute
triangle
36
7272
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
Area ofIrregular 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 10 units² The area is approximately 32 units²
Box & Whisker PlotA 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
18 27 34 52 54 59 61 68 78 82 85 87 91 93 100
Equiangular TriangleA triangle with three congruent angles
(and also three congruent sides)
60 60
60
Equilateral TriangleA triangle with three congruent sides
(and also three congruent angles)
Examples
Exponent Notation A number written with a base an exponent
Examples
32 8
211Base
Exponent
= 64
Exponent The number that indicates how many times
the base is used as a factor
Examples
34 4 4 4 24 4 4
44 4 4 4 4 28 8 8 base
Inequalities(number line)
The graph of a mathematical sentence showing the relationship between quantities that are not equal,
using <, >, <, >, or
Examples
2x
4x
2x
2x
IntegerThe set of whole numbers and their opposites
Examples
Integers
120
2 2
Use the remaining integers to Make every circle add to zero
Isosceles Triangle A triangle with (at least) two congruent sides
The two congruent sides are called legsThe third side is the base
The angle formed by the legs is the vertex angle
Examples:
legleg
base
Vertex angle
Linear Equation An equation that can be represented as a line
on the coordinate plane
Examples
2x y 3y x 2 3y x
Multi-step EquationsAn equation where you have to do more than one
operation in order to find the solutions
Examples
2 3 17
2 20
10
x
x
x
3( 1) 15
3 3 15
3 12
4
x
x
x
x
5 2 18
3 18
6
x x
x
x
Obtuse Triangle
A triangle containing exactly one obtuse angle(an angle greater than 90 degrees)
90
OppositeTwo numbers (represented by points on the
number line) that are the same distance from zero and are on opposite sides of zero
Examples
1 1
and are opposites2 2
The opposite of 0 is 0
4 and -4 are opposites
8 and -8 are opposites
Percents (above 100, below 1)A percent is a ratio that compares a number to 100
Percent means “per hundred”Examples
11/10
110%
+1
.
.7 10 7.7%
100 10 1000
A percent above 100 means you have more than a whole: 1 5 250
2 250%2 2 100
Pi (approximation)
The ratio of the circumference of a circle to the length of its diameter
Examples
C
d 12.56C cm
4d cm
12.563.14
4
10d cm
31.43.14
10
31.4C cm
3.14159265358979323846264338327950288419716939937510582...
Rational NumbersAny number that can be expressed as a ratio
where a and b are integers and b 0Decimals representing rational numbers
either terminate or repeat
Examples
a
b
( is irrational)
66
1
1.3
3
Real Numbers
Rational NumbersIrrational numbers
Integers
Whole numbers
Natural numbers
00
1
2
3
2
3
.1
19
.
22
9
Regular Polygon A polygon in which all sides and all angles are congruent
Examples
Equilateral triangle
square
pentagon
hexagon
heptagonoctagon
nonagon
decagon
Right TriangleA triangle with exactly one right angle
Examples
90 90
Scale FactorThe common ratio for pairs of
corresponding sides of similar figures The ratio used to enlarge or reduce objects
Examples
The scale factor is 2
4
63
8
5
10
Models: if a car is 204” in length and the length of a model of the car is 12” long, the scale factor would be
12 1
204 176 8 10
23 4 5
Scalene TriangleA triangle with no congruent sidesIts sides are all different in length
(Its angles are also all different in size)Examples
a b c
1014
20
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
SimilarityFigures that have the same shape, but not necessarily the same size
Examples
Similar Similar
6565
2525
Similar polygons have congruent corresponding angles
Similar polygons havecorresponding sides that formequivalent ratios (proportions)
2
54
102 5
4 10