๐– ๐–ข๐—ง ๐—†๐–บ๐˜๐— ๐—บ๐—Ž๐—Œ๐˜-๐—„๐—ป๐—ผ๐—๐—Œ (๐–ป๐–บ๐˜€๐—‚๐—ฐ)เญจเญง

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โœฉ= ๐–ฟ๐—ฟ๐—ฒ๐—Š๐˜‚๐–พ๐—‡๐˜๐—น๐—’ ๐˜‚๐—Œ๐—ฒ๐–ฝ ๐–ฝ๐˜‚๐—ฟ๐—‚๐—‡๐—ด ๐—‰๐—‹๐—ฎ๐—ฐ๐—๐—ถ๐—ฐ๐–พ ๐—๐–พ๐˜€๐—๐—Œ

ACT

Math

21 Terms

1

โœฉSlope-intercept

y=mx+b

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2

โœฉโœฉslope formula

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

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3

โœฉPythagorean theorem

aยฒ+bยฒ=cยฒ

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4

Circle

(x-h)ยฒ+(y-k)ยฒ=rยฒ

(h,k): center of circle

r: radius

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5

Area of a circle

A= ฯ€rยฒ

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6

Circumference of a circle

C= 2ฯ€r

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7

Distance

d=โˆš(x2-x1)ยฒ-(y2-y1)ยฒ

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8

โœฉMidpoint

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

(Think how to find an average.แŸ)

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9

โœฉSlope

Rise/ run

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10

Area of a triangle

A= 0.5bh

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11

Area of trapezoid

[(b1+b2)*h]/2

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12

โœฉSOH CAH TOA

sine: opposite/ hypotenuse

cosine: adjacent/ hypotenuse

tangent: opposite/ adjacent

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13

quadratic formula

(-bยฑโˆšbยฒ-4ac)/2a

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14

Difference of squares

aยฒ-bยฒ= (a-b)(a+b)

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15

Logarithms

logb (x)=y means bสธ= x

b= base

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16

Diagonal of a square

(side)โˆš2

How to remember: square is a 2D object, thus โˆš2โ€Ž(แก`แง ๏ปŒ แงยดแก)

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17

Diagonal of cube

(Side)โ€Žโˆš3

How to remember: cube is a 3D object, thus โˆš3 ๏ผต*`โˆ€ยด*๏ผต

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18

Area of rhombus

A= (p*q)/2

p and q= diagonals of rhombus

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19

โœฉPercentage increase/ decrease formula

(difference/ original)*100

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20

โœฉCompound interest formula

A=P(1+สณโ„โ‚™)^nt

A=amount

P=original amount

r=interest rate

n=number of times interest is compounded per year

(n)t= time (usually years)

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21

prime numbers

1 is NOT a prime number!!!!!

2 is the only even prime number, also the smallest prime number

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