๐—”๐—–๐–ณ ๐—†๐—ฎ๐˜๐— ๐—†๐˜‚๐˜€๐—-๐—„๐—ป๐—ˆ๐˜„๐˜€ (๐—ฏ๐–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

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21 Terms

1
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โœฉSlope-intercept

y=mx+b

2
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โœฉโœฉslope formula

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

3
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โœฉPythagorean theorem

aยฒ+bยฒ=cยฒ

4
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Circle

(x-h)ยฒ+(y-k)ยฒ=rยฒ

(h,k): center of circle

r: radius

5
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Area of a circle

A= ฯ€rยฒ

6
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Circumference of a circle

C= 2ฯ€r

7
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Distance

d=โˆš(x2-x1)ยฒ-(y2-y1)ยฒ

8
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โœฉMidpoint

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

(Think how to find an average.แŸ)

9
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โœฉSlope

Rise/ run

10
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Area of a triangle

A= 0.5bh

11
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Area of trapezoid

[(b1+b2)*h]/2

12
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โœฉSOH CAH TOA

sine: opposite/ hypotenuse

cosine: adjacent/ hypotenuse

tangent: opposite/ adjacent

13
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quadratic formula

(-bยฑโˆšbยฒ-4ac)/2a

14
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Difference of squares

aยฒ-bยฒ= (a-b)(a+b)

15
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Logarithms

logb (x)=y means bสธ= x

b= base

16
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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)

17
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Diagonal of cube

(Side)โ€Žโˆš3

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

18
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Area of rhombus

A= (p*q)/2

p and q= diagonals of rhombus

19
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โœฉPercentage increase/ decrease formula

(difference/ original)*100

20
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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)

21
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prime numbers

1 is NOT a prime number!!!!!

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