Need 2 know math SAT formulas

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19 Terms

1
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Slope of a line

(y2 - y1)/(x2 - x1)

2
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Slope intercept form

y=mx+b

3
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Midpoint formula

(x+x)/2, (y+y)/2

4
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Length of an arc

s = n/360 × 2πr

5
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Area of a sector

A = n/360 × πr²

6
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Degrees to radians

radians = degrees × (π/180)

7
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Quadratic formula

x = -b +or- √(b² - 4ac) / 2a

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SOH

sine = opposite/hypotenuse

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CAH

cosine = adjacent/hypotenuse

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TOA

tangent = opposite/adjacent

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Probability

#of desirable outcomes / # of total outcomes

12
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Equation of a circle

(x - h)² + (y - k)² = r²

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Exponential growth

y = a(1 + r)^t

14
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Arithmetic sequence

an = a1 + d(n-1)

15
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Geometric sequence

an = a1 r^(n-1)

16
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Vertex of a parabola

x = -b/2a

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Vertex form

y = a(x - h)² + k

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Pythagorean Theorem

a² + b² = c²

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Area of a triangle

A = bh/2