GRE MATH
Card Set Information
Author:
ceemlo
ID:
263424
Filename:
GRE MATH
Updated:
2014-02-23 02:07:44
Tags:
GRE
Folders:
Description:
GRE
Show Answers:
The 3 angles in a triangle add up to?
180 degrees
The 4 angles inside
any
4 sided figure add up to?
360 degrees
Equilateral triangles
All sides are equal
All angles are 60 degrees
Isosceles triangles
2 sides are equal
2 angles are equal
Perimeter of a triangle
Add all the sides
Third side rule
The length of any one side of a triangle must be
less
than the sum of the other sides
And
greater
than the difference between the other 2 sides
Area of a triangle
A= 1/2bh
When 2 lines intersect and 4 angles are formed, the sum of these angles is?
306
How many degrees does a circle contain?
360 degrees
Vertical angles are?
Always equal
In parallel lines, the sum of any big angle and any small angle will always equal to?
180 degrees
Popular sides of right triangles
3 4 5
6 8 10
5 12 13
Perimeter of a rectangle
Sum of its 4 sides
Area of a rectangle and square
A= bh
Area of a circle
A= πr²
Circumference of a circle
C= 2πr
C= πd
The point where the axes intersect is called?
Origin
Slope of a line equation
y= mx+b
b= y-intercept
m= slope
x and y are any point on the line
Slope
Rise/Run
Equation to find the length of a diagonal inside a 3 dimensional rectangular box
a²+b²+c²=d²
a,b,c are the dimensions of the figure
Volume of three dimensional figure
V= A(of 2 dimensional figure) h (depth)
Volume of a circular cylinder
πr²h
Surface area of a rectangular box
Sum of the areas of all its sides
Integers
Counting numbers
0 is an integer
Fractions are not
Factors
Is a number that will divide evenly into the number in the question
Prime numbers
Is an integers that only has 2 factors:
Itself and 1
0 and 1 are not prime numbers
2 is the only
even
prime number
Prime numbers are only positive
PEMDAS
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction
Product
Result in multiplication
Quotient
Result of a division
Associative laws
When you are adding or multiplying a series of numbers, you can regroup them in any way you want
Multiplying with exponents
2¹ x 2²
You add them
2³
Multiplying with exponents and parenthesis
(2¹)²
You multiply them
2²
Dividing with exponents
2³/2²
Subtract them
2¹
When GRE asks you for the √ of something
It is asking you for the positive root only
If x²=16, then GRE is asking for
The positive and negative numbers
x=4, x=-4
√1
1
√2
1.4
√3
1.7
√4
2
x²-y²
(x+y)(x-y)
(x+y)²
x²+2xy+y²
(x-y)²
x²-2xy+y²
2 2/3
Multiply the denominator by the integer, then adding that number to the numerator
8/3
1/100
0.01
1%
1/5
0.2
20%
1/3
0.333...
33 1/3%
1/2
0.5
50%
1/10
0.1
10%
1/4
0.25
25%
2/5
0.4
40%
3/5
0.6
60%
2/3
0.6666...
66 2/3%
4/5
0.8
80%
2/1
2.0
200%
3/4
0.75
75%
1/1
1.0
100%
Symbol translation: Percent
/100
Symbol translation: is
=
Symbol translation: of, times, product
x
Symbol translation: what (or any unknown value)
any variable (x, k, b)
Percent increase/decrease
Percent change= difference/original x 100
How are ratios expressed in the GRE?
x: y
the ratio of x to y
x is to y
What is a proportion?
An equivalent relationship between 2 fractions or ratios
1/2 and 4/8
Chart on how to solve average questions
When you see
standard deviation
or
normal
distribution
questions
Chart on how to solve rate questions