GRE math
Help!
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| 1^2 | 1
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| 2^2 | 4
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| 3^2 | 9
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| 4^2 | 16
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| 5^2 | 25
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| 6^2 | 36
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| 7^2 | 49
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| 8^2 | 64
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| 9^2 | 81
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| 10^2 | 100
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| 11^2 | 121
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| 12^2 | 144
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| 13^2 | 169
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| 14^2 | 196
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| 15^2 | 225
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| 16^2 | 256
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| 17^2 | 289
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| 18^2 | 324
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| 19^2 | 361
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| 20^2 | 400
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| 4^1/2 | 2
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| 9^1/2 | 3
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| 16^1/2 | 4
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| 25^1/2 | 5
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| 36^1/2 | 6
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| 49^1/2 | 7
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| 64^1/2 | 8
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| 81^1/2 | 9
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| 100^1/2 | 10
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| 121^1/2 | 11
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| 144^1/2 | 12
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| 169^1/2 | 13
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| 196^1/2 | 14
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| 225^1/2 | 15
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| 256^1/2 | 16
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| 289^1/2 | 17
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| 324^1/2 | 18
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| 361^1/2 | 19
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| 400^1/2 | 20
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| 2^3 | 8
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| 3^3 | 27
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| 4^3 | 64
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| 5^3 | 125
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| 6^3 | 216
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| 7^3 | 343
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| 8^3 | 512
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| 9^3 | 729
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| 10^3 | 1000
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| 8^1/3 | 2
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| 64^1/3 | 4
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| 27^1/3 | 3
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| 125^1/3 | 5
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| 216^1/3 | 6
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| 343^1/3 | 7
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| 512^1/3 | 8
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| 729^1/3 | 9
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| 1000^1/3 | 10
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| Circumference of a circle | C=2πr or πd
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| Area of a square | A=s^2
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| Area of a rectangle | A=L*W
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| Area of a parallelogram | A=B*H
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| Area of a trapezoid | A = ((height)(base1+base2))/2
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| Area of a triangle | A=(B*H)/2
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| Units of perimeter | inches, meters, etc.
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| Units of area | square inches, meters, etc.
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| Tangent | Straight line that touches outer edge of circle, has one point in common with circle
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| Chord | Line segment with endpoints that lie on a circle. (lines that start and stop at the perimeter of a circle)
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| Right triangle | A triangle inscribed within a circle and that has one side that is a diameter of that circle
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| Volume of a cube | S∧3
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| Volume of rectangular box | L*W*H
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| Surface area of an object | The sum of the area of each of the rectangular sides
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| Surface area of a rectangular solid | 2Lw + 2wh + 2Lh
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| Surface area of a cube | 6s^2
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| Volume of a sphere | (4πr^3)/3
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| Surface area of a sphere | 4πr^2
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| Volume of a cylinder | hπr^2
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| Surface Area of a cylinder | 2π(r^2)+2πrh
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| Quadratic Equation | -b±(( b^2)-4ac)^1/2))/2a
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| Sum of all interior angles in a triangle | 180 degrees
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| Equilateral Triangle | A triangle with equal side and angle measurements (each angle equals 60 degrees)
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| Isoceles Triangle | Triangles with two equal interior angles and sides opposite the equal angles are also equal in length
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| Right triangle | Have 1 angle that measure 90 degrees
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| Pythagorean theorem | Calculates length of hypothenuse of right triangle a2+b2=c2
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| 45-45-90 Right triangle | Ratio of the sides is 1:1:square root of 2.
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| 30-60-90 right triangle | Ratio of the sides is 1 :square root of 3:2. shortest side is opposite the 30-degree angle.
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| 3-4-5 Right triangle | Short side=3, middle=4 and hypotenuse=5, this ratio can be applied to 18,24,30 triangle, etc.
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| Distance formula (find distance between two points on a line) | =((x1-x2)^2+(y1-y2)^2)^1/2
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| Slope formula | (y1-y2)/(x1-x2)
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| Find y-intercept | plug slope and one set of coordinates into y=mx+b and solve for b
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| Find x-intercept | plug slope, 0 for y and b into the equation solve for x
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| Sum of the interior angles of a polygon | =(#of sides-2)x180; i.e. triangle (3sides-2)=1*180=180
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| Formula for distance | d = (r)(t) or Distance = rate (or speed)xtime
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| 3x3 | 9
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| 3x4 | 12
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| 3x5 | 15
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| 3x6 | 18
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| 3x7 | 21
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| 3x8 | 24
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| 3x9 | 27
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| 3x12 | 36
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| 3x13 | 39
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| 4x4 | 16
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| 4x5 | 20
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| 4x6 | 24
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| 4x7 | 28
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| 4x8 | 32
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| 4x9 | 36
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| 4x12 | 48
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| 4x13 | 52
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| 5x5 | 25
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| 5x6 | 30
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| 5x7 | 35
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| 5x8 | 40
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| 5x9 | 45
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| 5x12 | 60
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| 5x13 | 65
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| 6x6 | 36
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| 6x7 | 42
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| 6x8 | 48
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| 6x9 | 54
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| 6x12 | 72
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| 6x13 | 78
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| 7x7 | 49
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| 7x8 | 56
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| 7x9 | 63
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| 7x12 | 84
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| 7x13 | 91
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| 8x8 | 64
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| 8x9 | 72
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| 8x12 | 96
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| 8x13 | 104
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| 9x9 | 81
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| 9x12 | 108
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| 9x13 | 117
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| 11x11 | 121
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| 11x12 | 132
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| 11x13 | 143
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| 12x13 | 156
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| Distance formula | d=r*t
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| What are the 2 main types of motion problems you will encounter | 1. opposite direction (collision) 2. same direction different speeds 3. round-trip
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| Opposite direction equation | ---><---- d1+d2=total distance
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| Same direction problems | ---->---> d1=d2
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| area of a circle | πr^2
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| What is mode | The number the occurs the most
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| Which lines have opposite reciprocal slopes | perpendicular
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| Which lines have the same slopes | parallel
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| What is reciprocal | 1/2 & 2/1.... 3/4 & 4/3
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| What is area of a triangle? | area=1/2*b*h
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| What are the sides for an isosceles right triangle? 45' 45' 90' | side Length=x; Base=x; angled side (hypotenosis) = x √ 2
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| What is obtuse? | exceeding 90 degrees but less than 180 degrees
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| What is acute? | one less than 90 degrees
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| What is circumference of a circle? | c=pi * D, where D is the diameter.
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