# SAT Formulas (copy)

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Slope of a Line

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## Description and Tags

### 21 Terms

1

Slope of a Line

m = (y2-y1)/(x2-x1)

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2

Slope-Intercept Form

y = mx+b

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3

Point-Slope Form

y-y1 = m(x-x1)

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4

Midpoint Formula

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

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5

Distance Formula

distance = sqrt((x2-x1)Â˛+(y2-y1)Â˛)

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6

Length of an Arc

length = (n/360)2pir

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7

Area of a Sector

area = (n/360)pirÂ˛

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8

x = (-bÂ±sqrt(bÂ˛-4ac))/2a
y = axÂ˛+bx+c

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9

SOHCAHTOA

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10

Probability

# of favorable outcomes/total number of outcomes

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11

Circle Equation

(x-h)Â˛+(y-k)Â˛=rÂ˛
h = x coordinate of the middle of the circle
k = y coordinate of the middle of the circle

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12

Exponential Growth

y = a(1+r)^t
a = initial value
r = rate
t = time

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13

Vertex of a Parabola

x = -b/2a

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14

Vertex Form

a(x-h)Â˛+k
vertex = (h, k)

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15

Pythagorean Theorem

aÂ˛+bÂ˛ = cÂ˛

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16

Distance = Rate x Time

d = rt

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17

Sine & Cosine

sin(x) = cos(90-x)

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18

Discriminant

bÂ˛-4ac

bÂ˛-4ac < 0 | no real solutions
bÂ˛-4ac = 0 | 1 real solution
bÂ˛-4ac > 0 | 2 real solutions

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19

Pythagorean Triples

3, 4, 5
5, 12, 13
7, 24, 25
8, 15, 17
can be multiples of any of these too

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20

Perpendicular Slope

opposite reciprocal
neg â†’ pos or pos â†’ neg, then swap numerator/denominator

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21

Sum of Angles

sum = (n-2)180
n = number of sides

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