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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