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89 Cards in this Set

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equilateral triangles
all sides = 60
3rd Side Rule
3rd side must be greater than the difference of the other two and less than the sum of the other two
similar triangles
sides are proportional
Common Triples
3:4:5
5:12:13
Isoceles Right triangle
45-45-90
sides are 1:1:root2
30-60-90 triangle
1:root3:2
divisible by 3 or 9
sum of digits must be divisible by 3 or 9
divisible by 4
last 2 digits divisible by 4
divisible by 6
must be divisible by 2 and 3
sq. root of 169
13
sq. root of 196
14
sq. root of 225
15
sq. root of 256
16
sq. root of 625
25
cube root of 64
4
cube root of 125
5
cube root of 216
6
convert 3:4 to a fraction
3 (or 4) / 7
Super Pythag
a^2+b^2+c^2=d^2
angles of a regular polygon add up to
(#sides - 2) x 180
Area of a trapezoid
1/2 (b1 +b2)(height)
in comparing the areas of triangles/quadrilaterals, look for
shared bases
Group Formula
if overlap:
A + B + Neither - Both = Total

if no overlap:
use grid
Standard Deviation percents
2-14-34-34-14-2
0!=
1
1!=
1
Beginning of PENMDAS
Parenthesis, Exponents, Negation
factors of quadratic equation that is (+,+)
(+,+)
factors of quadratic equation that is (-,+)
(-,-)
factors of quadratic equation that is (+,-)
biggest is +
factors of quadratic equation that is (-,-)
biggest is negative
equation of: (x+y)^2
x^2 + 2xy + y^2
factors of: x^2 + 2xy + y^2
(x+y)^2
equation of: (x-y)^2
x^2 - 2xy + y^2
factors of: x^2 - 2xy + y^2
(x-y)^2
equation of: (x+y)(x-y)
x^2-y^2
factors of: x^2-y^2
(x+y)(x-y)
(8-x)^2
64-16x+x^2
Geometric Mean
square root
slope is
change in y
change in x
equation of a line
y=mx+b
y intercept
x=0
x intercept
y=0
slope>1
closer to y axis
slope<1
closer to x axis
diagonal of a square=
side x root2
diagnal of a square =
side x root2
first prime #
2
"and" probability problems
multiply
"at least" probability problems
1- NOT
(not may be multiplication because "and)
When order doesn't matter
less discrete elements (small #, placeholders on bottom)
When order does matter
more discrete numbers (bigger, no placeholders)
Interquartiles
divide into 2 groups, take median (Q2);
then divide two groups into two more and take those medians (Q1 and Q3)
Interquartile range
Q3-Q1
square root of 121
11
square root of 144
12
cube root of 8
2
cube root of 27
3
Integer
No decimal or fractions
digits
0-9 (phone pad)
"distinct"
different (e.g. 2 and 3 are distinct)
9/4
225%
225%
9/4
2.25
9/4
66%
.66666666
66%
2/3
12.5%
1/8
1/8
12.5%
.125
1/8
37.5%
3/8
3/8
37.5%
3/8
.375
62.5%
5/8
5/8
62.5%
5/8
.625
87.5%
7/8
7/8
87.5%
7/8
.875
root 3 means
30-60-90 triangle somewhere
root 2 means
45-45-90 triangle somewhere
perpendicular lines
slopes are negative recipricals (eg. 5 and -1/5)
exponent (trigger)
break into common factors, regroup
root 2=
1.4 (Valentines)
root 3=
1.7 (St. Paddy's)
"part/arc/sector of a circle"
Central angle/360 = arc/circum = sector/area
to find intersection of two lines
1.) set line equations equal to eachother and solve 2.) plug in x into either equation
"combination"
order doesn't matter, #s on bottom
"arrangement"
order does matter
range
difference b/w largest and smallest # in a set