SAT Math Formulas
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20 Terms
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Slope of the line
(y2-y2)/x2-x1)
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Distance Formula
√(x2-x1)²+(y2-y1)²
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Midpoint Formula
(x1+x2)/2,(y1+y2)/2
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Slope-Intercept
y=mx+b
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Standard Form
Ax+By=C
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Standard form slope
-A/B
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standard form y-intercept
(0,C/B)
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horizontal line
y=#. m=0`
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vertical line
x=#, m=undefined
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30-60-90 Triangle
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Pythagorean Theorem
a²+b²=c²
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45-45-90 Triangle
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Area of triangle
A=(1/2)bh
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circle graph equation
(x-h)²+(y-k)²=r²; center=(h,k)
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circumference
2πr
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Area of Circle
πr²
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Length of arc
(n/360)2πr; n=inner circle angle
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area of sector
(n/360)πr²
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Inscribed Angle
m∠BEC=1/2m.arcBC, m.arcBC=2*∠BEC
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