Digital SAT Math Equations

SAT Math equations that are on the quiz but aren't given to you

Slope Formula

(y2-y1)

(x2-x1)

Equation of a Line

y=mx+b

• m is the slope of the line.

• b is the y-intercept (the point where the line hits the y-axis).

• If the line passes through the origin (0,0), the line is written as y=mx

Midpoint Formula

((x1+x2)/2 , (y1+y2)/2))

Distance Formula

Square root of (x2-x1)² + (y2-y1)²

Arc Length

(2πr)(degree measure of arc/360)

Area of Arc Sector

(πr²)(degree measure center of arc/360)

Quadratic Formula

−b± the square root of b²−4ac/2a

Mean

Average

Speed

Distance over time

Probability

number of desired outcomes/total number of possible outcomes

Find x percent of a given number n

n(x/100)

Find out what percent a number n is of another number m

(n100)/m

Find out what number n is x percent of

(n100)/x

Sin, Cos, Tan

SOH CAH TOA

Sin

Measure of the opposite side to the angle / Measure of the hypotenuse

Cos

Measure of the adjacent side to the angle / Measure of the hypotenuse

Tan

Measure of the opposite side to the angle / Measure of the adjacent side to the angle