GRE formula Flashcards
Area of a square
A=2S
Perimeter of a Square
P = 4S
Area of a Rectangle
A = LW
Perimeter of a Rectangle
P= 2L+2W
Area of a circle
A=“r^2
Circumference of a circle
C= 2”R^2
Area of a Triangle
A =1/2 BH
Degrees of a triangle
Triangles have to have 180*
Sides of right triangles
A^2+b^2=C^2
Or A^2=c^2/B^2
Two special triangles
3^2 +4^2=5^2
And
5^2+12^2 =13^2
Sides of the 30-60-90 triangle
A +2A + A(sqroot)3
Sides of the 45-45-90 triangle
A+A+(sqroot)2
Equilateral Triangle
All sides equal
Each angle is 60*
Are made up of 2 equal triangles of 30-60-90* angles
Area of equilateral Triangle
A=(sqroot)3/2 xS^2
Perimeter of equilateral triangle
P=3A
Height of a equilateral triangle
H=(sqroot)3/2 xS
6 laws of even and odd
Even + even = even Odd + Odd = even Even + Odd = Odd Even x even =even Odd xOdd = odd Even x odd = even
Distance formula
D=RT
R=D/T
T=D/R
Slope
M=slope X = x point B= y point
Y=MX+B
To find slope from points
S= Y2-Y1/ X2-X1
Mean, Mode, Range and Median
Mead= the average Median= the middle Mode = the number that is repeated the most Range = the difference between the highest and lowest number
4 shifts of graph y=f(x)
Y=f(x)+ C …Shifts graph up.
Y=f(x)-C…… Shifts graph down.
Y=f(x+c).. .. Shifts graph to the LEFT
Y= F (x-c)…. Shifts graph to the RIGHT
Volume of a cube
V= S ^3 (S=sides)
Regular Prism Volume
Sides are ABC
V= AxBxC
Volume of irregular Prism
V= BH. B=base H=height
Volume of a cylinder
V= “r^2xH
Volume of a Pyramid
V= 1/3BH
Volume of a cone
V= 1/3 “ r^2 H
Volume of a Sphere
V= 4/3 “ r^3
