## Glossary of sat II math 1

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- integers are
- whole #s

- exponential growth:
- Sn= first term - nth term

divided by

1 - ratio between consecutive terms

- union of elements (U)
- elements that are in either or both

- intersection of elements (N)
- common to both sets

- relative primes
- have no prime factors in common

- the "part" keywords
- is/are

- the "whole" keywords
- of

- percent formula
- part= percent x whole

- to increase a # by a percent
- add percent to 100, conver to decimal, and multiply

- finding the original whole
- ex. 25 percent increase over x is 1.25x.

- ratios
- of

----

to

- part to part ratios
- each # in original ratio over the sum of the #s

- average speed!
- average speed= total distance / total time

v= d/t

- mode
- value that appears most often

- probability
- favorable outcomes/ total possible outcomes

- inverse variations
- xy=k

k is constant

- distance formula
- d= square root (x1-x2)2 + (y1-y2)2

- midpoint formula
- (x1 + x2 / 2) , (y1 + y2 / 2)

- exterior angles of a triangle
- are equal to the sum of the remote interior angles

- the 3 exterior angles of a triangle add
- up to 360 degrees

- triangle inequality theorem
- the length of 1 side of a triangle must be greater than the difference and less than the sum of the other two sides

- 30-60-90 triangle
- x: x (radical 3) : 2x

- 45- 45- 90 triangle
- x: x: x(radical 2)

- interior angles of a polygon
- sum of angles = (n-2) x 180

n is # of sides

- circumference of cirlce
- C= 2 pie r

- area of circle
- pie r squared

- area of a sector of circle
- (n / 360) (pie r squared)

- surface area of rectangle solid
- SA= 2lw + 2wh + 2lh

- volume of recntagular solid
- V= lwh

- volume of cylinder
- v= (pie r squared) x h