GRE memorization

percent change

new - old

---

old

average

sum / # of terms

order matters

use just factorial

order does not matter

use some of factorial, then divide by output number

distance formua

rate x time

work formula

rate x time

tangent

touches curved line once and forms 90 degree angle with radius

parallelogram area

base x height (NOT side x side)

trapezoid area

1/2(b₁ + b₂)h

circle area

πr²

circle circumference

2πr

right triangles

3-4-5

5-12-13

8-15-17

*may scale the numbers

standard deviation

how spread out the data is

multiplying different bases, same exponent

multiply base, exponent stays the same

multiplying same base, different exponent

keep base, add exponents

3 divisibility rule

a number is a multiple of 3 if the sum of the digits is divisible by 3

writing intro

1) hook: state stance

2) while some argue…

3) thesis: stance and supporting reasons

“i firmly believe”

body paragraphs

1) introduce reason

2) provide SPECIFIC evidence

3) explanation

concession paragraph

1) topic sentence

2) example

3) explanation

4) rebuttal

“while valid, i still believe xyz is optimal”

conclusion paragraph

1) restate thesis

2) summarize body paragraphs