SAT Math Key formulas

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18 Terms

1
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aman

am+n

2
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am/an

am-n

3
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(ab)n

anbn

4
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(a/b)n

an/bn

5
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a-n

1/an

6
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point slope formula

y - y₁ = m(x - x₁)

7
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formula for equations like 4×2

P = Crt where P is the origin, C is the constant, r is the rate, and t is the time.

8
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minimum / maximum value formula

x = -b/2a

9
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Vertex form

y = a(x - h)² + k, where (h, k) is the vertex.

10
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distance formula

d² = (x2-x1)² +(y2-y1)²

<p>d² = (x<sub>2</sub>-x<sub>1</sub>)² +(y<sub>2</sub>-y<sub>1</sub>)²</p>
11
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quadratic formula

-b plus or minus sqrt b2-4ac / 2a

<p>-b plus or minus sqrt b<sup>2</sup>-4ac / 2a</p>
12
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area of an equilateral triangle

sqrt 3 / 4 * a²

<p>sqrt 3 / 4 * a²</p>
13
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Equation of a circle

(x - h)² + (y - k)² = r², where (h, k) is the center and r is the radius.

14
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Length of arc

Length of arc / circumference = Angle / 360

15
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Area of sector

Area of sector / area of circle = angle / 360

16
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Circumference of a circle

2πr / πd

17
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Area of a circle

πr2

18
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Diameter of a circle

d = 2r