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Square Perimeter, Area
P=4s A=s2
Rectangle Perimeter, Area
P=2(L+W), A=LW
Circle Perimeter, Area
C=2∏r, A= ∏r2
Triangle Area
A=(1/2)bh
Cube Volume
V=s3
Rectangular Solid Volume
V=LWH
Cylinder Volume
V=∏r2h
Sphere Volume
V=(4/3)∏r3
Standard eq for circle?
(x-h)2 + (y-k)2 = r2
1 revolution = radians?
2∏ radians
perpendicular lines have what relations with slope?
negative recipocal slopes!
change this to just ln... -x=ln(1/2)
x=ln(2), divide out minus sign and flip over the fraction.
sin(2X)=?
2sin(X)cos(X)
sin2xcos2x=?
1
cos2 x=?
1-sin2 x
cot x= ?
cosX/sinX
tan2x + 1 =?
sec2x
cot2x + 1 =?
csc2x
ln(sinx/cosx) =?
sinx-cosx
cos[x-y]=?
cosxcosy - sinxsiny
sin (θ) = cos ?
cos(90-θ)
convert degrees to radians?
90degrees x ∏/180degrees
length of arc equation?
s=(θ)r must be inradians!
standard form for circle equation
(x-h)2 + (y-k)2= r2
polygons eqs? exterior/interior angles!
inf. 180(n-2) ext. 360/n
what is the angle of depression?
person on top of building looking down.. the ANGLE LOOKING BACK AT HIM! ground to him.
Quadrant problems? how to do?
bottom right to CCW circle >> CAST if in sin quad but asking for cos, then cos is NEGATIVE
fill with exponents
practice converting percentages to decimals.
speed=?
distance/time
paint a fence at two different rate problems?
[(time1)(time2)/Total time] this is the rate for them doing it together.
Inequality sign changes when?
Multiple or divide both sides by a NEGATIVE. reverse the sign!
Interests equations
I=Prt I>interest paid P>Principle (amt borrowed) R>interest rate T> Time in YEARS
square roots.
change farienheits to Celuis?
F=(9/5)C + 32
try using scientific notation if needed or if in the answers
median?
is the middle value of the sample but make sure you rank your numbers in size.
mode?
most common number.
when ever you formulate an eq and you have two unknowns.. there has to be a second eq.
(3√996)2 = ?
3√1000 = 10, then 102 equals 100
√(√606)=?
round it to 600√6 * √100 = 10√6 = 10√3√2 = 10(1.7)(1.4) ≈ 25 so √25 = 5
big sum E3a=1 with a=1 and a small 3 uptop
a = 1,2,3. and u plug them all in and add.
distance equations between two points
AB = √((x2-x1)2 + (y2-y1)2)
6√(100) =?
1001/6 = 1001/2*1/3
rate =?
distance/time
10-3
.001  start at the 1
diagonal of a square (inside of a circle) = 2r and to find the side of the square?
diagonal2/2 = side length
doing things together equations, pool ex.
1/rate1 + 1/rate2 = 1/rate together
13 years later equation
S + 13 = 2 (1/3S +13) - 1
cscΦ = ±
EMPTY! does not equal
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