Side x Side
Area of a Square
Side + Side + Side + Side
Perimeter of a Rectangle or square. add up each length.
Length ∗ width
Area of a Rectangle
Side + Side + Side
Perimeter of a Triangle
1/2 base times hieght
Area of a Triangle
∏d
Circumference of a Cirlce
∏r²
AREA of a Circle
Diameter
The distance accross the center of a circle from edge to edge
Radius
The distance form the center of a circle to the edge of the circle
A² + B² = C²
Pythagorean Theorum
P(n, r) = n!/(n - r)!
Permutation: When order matters
nCk = n!/k! (n - k)!
Combination: When order does not matter
y = mx+b
Equation for a line
m=y2-y1/x2-x1
SLOPE of a line through two points
.25x
25% of a number
x-3
Three less than a number
Mode
The value that occurs the most
desirable outcomes/ total outcomes
Probablility
Mean
The sum of the terms, divided by the total number of terms (aka average)
d=rt
Rate
Compound event
When two events happen at the same time
F = 9/5C+32
Celcius to farenheit