# ACT Math Formulas

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midpoint

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## Description and Tags

### 21 Terms

1

midpoint

add them together and divide by two

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2

distance

√(x-x)²- (y-y)²

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3

slope

rise/run

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4

slope-intercept

y=mx+b

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5

point slope

y-y1=m(x-x1)

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6

circle

(x-h)²+(y-k)²=r²

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7

ellipse

((x-h)²/a²)+((y-k)²/b²)=1

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8

volume of a cube

V=s³

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9

volume of a rectangular prism

V=lwh

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10

volume of triangular prism

V=1/2lwh

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11

volume of cylinder

V=πr²h

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12

volume of cone

V=1/3πr²h

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13

volume of a sphere

V=4/3πr³

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14

area of square

area=s²

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15

area of rectangle

area=lw

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16

area of triangle

area=1/2bh

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17

area of trapezoid

1/2(b1+b2)*h

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18

surface area of rectangular prism

area=2lw+2wh+2lh

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19

circumference of a circle

2πr

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20

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21

similar triangles

same angles different side lengths

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