ACT MATH

Area of Circle: pi r ^2
Circumference: pi d
Volume of cylinder: pi r ^2 h
A=2πrh+2πr2 = surface area of cylinder
Surface Area of Sphere = 4π r 2
Volume of Sphere = (4piR^3)/3
tan x = sin x/cos x
cot x = cos x/sin x
sec x = 1/cos x
csc x = 1/sin x
law of sines
Circle centered at ( h , k ) = ( x – h ) 2 + ( y – k ) 2 = r 2 , where r is the radius

Integers = whole numbers +/-
Composite numbers: more than two factors
square root of all prime numbers is irrational
distance formula
y−y1=m(x−x1) point slope form
Ax+By=C standard form
slope intercept form
perpendicular lines have slopes of 2/3 and -3/2
y = a ( x − h ) 2 + k vertex form of quadratic formula
FINDING THE VERTEX OF A PARABOLA
MATCHING GRAPHS WITH FUNCTIONS, TRANSLATION, STRETCHING, ETC
1 mile = 5,280 ft
1 yard = 3 ft
1 ounce = 1/16 pound
1 ton = 2,000 pounds
1 grain = 1/7000 pound
military time, 0 = midnight, 23 = 11:00, written w/out colon
When we multiply or divide both sides of an inequality by a negative number, we need to reverse the inequality symbol.
QUADRATIC FORUMULA: x = (-b ± √(b² - 4ac)) / (2a)