## GRE math review

##### Created by:

suhb01  on October 20, 2008

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# GRE math review

 percent formulapart = percent * whole
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#### Definitions

percent formula part = percent * whole
sum of consecutive numbers sum = average * number of terms
median number placed in a middle of a set
average of consecutive numbers average of smallest + largest. (S + L)/2
counting consecutive numbers B - A + 1 = number of integers
mode number that appears most often
range highest - lowest
probability p = number of favorable outcomes/total number of possible outcomes
area of a triangle A = 1/2 * bh
isosceles triangle two equal angles and sides
equilateral triangle 3 equal 60 angles. 3 equal sides
Pythagorean theorem a^2 + b^2 = c^2
special triangle (right) 3-4-5
special triangle (right) 5-12-13
special triangle (30-60-90) 1-2-sqrt3
special triangle (45-45-90) 1-1-sqrt2
area of a square A = side^2
area of a parallelogram A = bh
area of a trapezoid A = 1/2 h * (b1 + b2)
circumference of a circle C = 2pi*r
area of a circle A = pi * r^2
simple interest interest = (principal) x (interest rate) x (time)
compound interest final balance = principal * ( 1 + (interest rate/C))^((time)(C))
length of an arc arc = (n/360) x 2pi*r

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