GMAT

Created by shane_kercheval 

Upgrade to
remove ads

Area of a square

a^2

area of a rectangle

lw

area of a parallelogram

bh

area of a trapezoid

.5(a+c)h, where a and c are the lengths of the parallel sides

area of a circle

pi*r^2

Circumference of a circle

2pir

area of a sector of a circle

(x/360) PIr^2, where x is the degrees of the sector

what does a radian equal (in terms of degrees)

rad = deg * (PI/180)

What is the area of a triangle

.5bh (where b and h are right angles)

What is pathagorean theorem

A^2 + B^2 = C^2 where c is hypotenuse of triangle

What is the equation for combinations

order DOESN'T matter (without repetition, like lottery)
C = n! / ((n-k)k!)!
where k = number of objects selected from a pile of n objects
n = total number of objects from which k objects can be selected

what is the equation for permutations

order DOES matter
P = n^r (WITH REPETITION, r is how many you choose, n is total number of choices)
P = n! / (n-r)! (withOUT REPETITION)
where r = number of objects selected from a pile of n objects
n = total number of objects from which r objects can be selected
*if you are selecting all of them the formula is just n!

What is the quadratic equation

used to find the roots of polynomial equation of the second degree
x = (-b (+-) SQROOT(B^2 - 4AC)) / 2a

What does it mean to say that the probability of an event happening is impossible

P(E) = 0

What does it mean to say that the probability of an event happening is certain

P(E) = 1

What does P(E) mean

P(E) = number of outcomes in E / total number of possible outcomes.
EX. P({1,3,5}) and total set is {1,2,3,4,5,6}, => P({1,3,5}) = 3/6

What is the Probably that E does not occur?

P(not E) = 1 - P(E)

What does it mean to say that two sets are mutually exclusive events

if the event "E and F" is impossible. P(E and F) = 0

What does it mean tot say that sets A and B are Independent?

Two events A and B are said to be Independent if the occurrence of either even does not alter the probability that the other event occurs
P(A and B) = P(A)P(B)

What is a polygon

closed plane figure formed by three or more line segments (sides) each side intersects exactly two other sides at their endpoints.

What are vertices

points of intersections of the sides of a polygon

How do you find the distance between to lines on a graph?

Pythagorean Theorem

if machine X can produce 1,000 bolts in 4 hours and machine Y can produce 1,000 bolts in 5 hours, in how many hours can machines X and Y, working together at these constant rates, produce 1,000 bolts?

solve for (1/4) + (1/5) = (1/h)

If A and B and do a job in 4 hours when working together at their respective constant rates and A can do the job alone in 6 hours, in how many hours can B do the job alone

solve for (1/6) + (1/B) = (1/4)

What is the equation for distance

D = average speed * time

What is the equation for compound interest

Balance = P (1 + (R/N))^(TN)
P=principle
R = percent annual interest rate (decimal)
N = number of times compounded per year
T = number of years

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set