SAT Math Formulas

Slope of the line

Slope of the line

(y2-y2)/x2-x1)

Distance Formula

√(x2-x1)²+(y2-y1)²

Midpoint Formula

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

Slope-Intercept

y=mx+b

Standard Form

Ax+By=C

Standard form slope

-A/B

standard form y-intercept

(0,C/B)

horizontal line

y=#. m=0`

vertical line

x=#, m=undefined

30-60-90 Triangle

Pythagorean Theorem

a²+b²=c²

45-45-90 Triangle

Area of triangle

A=(1/2)bh

circle graph equation

(x-h)²+(y-k)²=r²; center=(h,k)

circumference

2πr

Area of Circle

πr²

Length of arc

(n/360)2πr; n=inner circle angle

area of sector

(n/360)πr²

Inscribed Angle

m∠BEC=1/2m.arcBC, m.arcBC=2*∠BEC