GRE review and prep

The flashcards below were created by user erica.kumar on FreezingBlue Flashcards.

  1. Acute angle is
    Angles that measure less than 90° are called
  2. Obtuse angles is ....
    Angles that measure more than 90°
  3. A right angle always measures...
    • exactly 90° and indicated by a little square where
    • the angle measure is
  4. Image Upload
    40 + n = 180 degress = straight line
  5. Image Upload
    Complementary Angles - because they add up to 90°.
  6. Image Upload
    Supplementary Angles, because they add up to 180°.
  7. Image UploadImage UploadImage Upload
    • Angles 1, 4, 5, and 8 are equal to one another.
    • 2, 3, 6, and 7 are equal to one another.
    • The sum of any two adjacent angles, such as 1 and 2 or 7 and
    • 8, equals 180º
    • Corresponding angles; Tranversal line intersects
  8. Image Upload
    • When two lines intersect, the angles that lie opposite each other,
    • called vertical angles, are always equal.
  9. Angles in a triangle equals...
    180 degrees
  10. Image Upload
    • An equilateral triangle has three equal sides and three equal
    • angles
  11. Image Upload
    • An isosceles triangle has two equal sides and two equal angles
    • Notice that the two equal angles are the ones opposite the two equal
    • sides
  12. A triangle with no equal sides and angles ...
    Scalene
  13. Image Upload
    • The exterior angle of a triangle plus the interior angle
    • with which it shares a vertex is always 180°. The exterior angle is
    • also equal to the sum of the measures of the remote interior angles.
  14. Image Upload
    • rule of sides
    • x is greater than the difference of the sides (10-4= 6)
    • but less than the addition of the sides (10+4 = 14)
  15. Image Upload
    • side a is the longest side and A is the largest
    • angle.
    • side c is the shortest side and c is smallest angle.
  16. Image Upload
    Pythagorean theorem is
    • a2 + b2 = c2
    • 32 + b2 = 52
    • 9 -25 = b2
    • 16 = b2 = b = 4
  17. Image Upload what are pythogoream's triples?
    • {3, 4, 5}
    • {5, 12, 13}
    • {7, 24, 25}
    • {8, 15, 17}
    • therefore z would be 5 x 10 = 50
  18. Image Uploadhow do know x and the value of the angles inside?
    • pythagoream ratio: s:s: s√2
    • therefore x = 5√2
  19. Image Upload
    • 30 60 90 triangle means ratio is s:s√3:2s
    • therefore 1:2:1√3
  20. Area of a Triangle is ?
    1/2 x base x height
  21. What is the total degrees inside a sqaure?
    360
  22. area of a square (2 formulas)
    • base x height
    • 1/2 diagonal 2
  23. Image Uploadarea?
    • 2 equal sides and 2 equal sides
    • all right angles
    • area = length x width
  24. Image Uploadarea?
    • area is base x height
    • 2 and 2 sides not necessarily right angles
  25. Image Upload
    • BE= ED and AE = EC
    • ∆ABD = ∆BCD
    • ∆AEB = ∆DEC and ∆BEC = ∆AED
  26. Image Uploadarea?
    • 1/2d1 x d2
    • or base x height
  27. Image Uploadarea?
    area = 1/2 (b1 + b2) x h
  28. Formula to calcuate degrees in polygons (all equal sides) and average for angle
    (n-2) 180 = total degrees

    for average divide by number of sides (n)
  29. triangle, quadrilateral, pentagon, hexagon, heptagon, octagon, nonagon, decagon, dodecagon... how many sides for each?
    3, 4, 5, 6, 7, 8, 9, 10, 12
  30. volume of a rectangle?
    Image Uploadl x w x h
  31. surface area of a rectangle?
    • Image Upload
    • 2lw + 2lh +2wh.
  32. volume and surface area of cube?
    • Image UploadVolume = s3
    • sa = 6s2
  33. Image Uploadvolume and surface area?
    • volume =πr2h
    • surface are = circumference x h x 2area of circle

    • circumference = 2πr
    • area= πr2
  34. Image Uploadcircumference?
    perimeter of a circle : 2πr
  35. Area of a circle is ?
    area = πr2
  36. Image Upload
    Image Upload
  37. Image UploadImage UploadImage Upload
    • AB = chord
    • tangent lines
    • central angle = cuts arch at same angle
  38. Image Upload
    • An inscribed angle will always cut out an arc in the circle that
    • is twice the size of the degree of the inscribed angle. For example, if
    • an inscribed angle is 40º, it will cut an arc of 80º in the circle.
  39. Image Upload
    a central angle in an inscribed angle will be twice the size
  40. Image UploadAB?
    • arc length =Image Upload
    • need c = 60
    • AB is twice because it is an inscribed angle
    • 120/360
  41. Image Uploadarea of sector?
    • Image Upload
    • central angle so 70/360
  42. If 2x + 3y = –6 and –4x + 16y = 13,
    what is the value of y?
    can add or subtract equations, if variables do not cross out think about mulitpling or dividing each side of one equation by the same number
  43. base to a power of 0 equals?
    1
  44. number to a negative exponent means?
    X-4
    1/X4
  45. x2+2xy +y2 = ????
    x2 +6xy + 9
    • (a+b)2
    • (x +3)2
  46. x2 – 2xy + y2
    x2–10xy + 25
    • (x –y )( x – y) = (x –y)2
    • (x –5)2
  47. (x +y)(x – y)
    (x + 4)(x – 4)
    • x2-y2
    • x2 - 16
  48. ratios:
    we are told ratio of boys to girls are 4 to 5 and there are 12 boys in the classes, how many girls are there?
    • boys = boys 4 = 12 4x = 12 x5 x= 60/4
    • girls girls 5 x

    x= 15
  49. Probability formula?
    In a bag containing 12 red, 13 white, and 15 black marbles, what is the probability of selecting a red marble on a single draw?
    • number of desired outcomes
    • total number of possible outcomes

    12/12+13+15 = 12/40 = 3/10
  50. distance formula?
    rate x time = distance
  51. work formula
    If you knit 2 sweaters per hour, and knit for 8 hours
    • rate x time
    • 2 per hour x 8 hours = 16
  52. What is a prime number?
    • positive number; divideable by itself and one other number only
    • 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59,
    • 61, 67, 71, 73, 79, 83, 89, and 97
    • solution : estimate square of number and then check all number below that number
    • 97 = 10 = check 2, 3, 5, 7,
  53. How to add or subtract fraction?
    need common denominator and numerators are added together or subtracted
  54. Multiplying fractions?
    4 x 1 x10
    5 8 11
    • numerators times and denominators
    • cancelling out = if any numerators are can be divided by the same number as a denominator

    • 4 and 8 divide by 4 and 5 and 10 divide by 5
    • 1 x 1x2 / 1 x 2 x 11
  55. Divide fractions?
    1 x 4
    2 5
    • all you have to do is flip the second fraction and then multiply
    • 5
    • 8
  56. ratios?
    For every 40 games a baseball team plays, it loses 12 games. What is the ratio of the
    team’s losses to wins?
    red, blue, and green marbles ratio of 5:4:3, and he has a total of 36 marbles. How many blue
    marbles?
    40 - 12 = won 28 games = 12:28 = 3:7

    • 5 + 4 + 3 = 12 = 36/12 = 3 times each by 3 to find how many
    • 5
  57. Percentages
    4 is what percent of 20?
    What percent of 2 is 5?
    • 4 = 20x = 400 =20x = 20%
    • 100

    5 = 2x/100 = 2x = 500 = x = 250%
  58. To convert .3875 into a fraction
    • delete decimal and has four digits after the decimal point, put four
    • zeros in the denominator following the number 1:
    • 3875/10000 and reduce
  59. percentage increase or decrease
    Sam pays $1.65 for a banana that was originally priced at $2.00
    Sam pays $2.00for a banana that was originally priced at $1.65
    • percentage increase
    • Image Upload

    • percentage decrease
    • Image Upload

    % increase or decrease = # increase or decrease divide by original number
  60. Exponents
    Adding or subtacting?
    multiplying?
    Dividing?
    factions to an exponent 1 to the exponent 3
    2
    • need to be same base 2x2 + 3x2
    • add exponents together
    • dividing subtracting exponents
    • 1x1x1 over 2x2x2
  61. roots
    multiple and divide
    Image Upload
  62. roots
    single number under a radical sign can be split into two numbers whose product is the
    original number
    Image Upload
  63. average if do not have all numbers
    average of class marks is 74. B got 50%; C got 60%; D got 90% and E got ??
    • average = sum divide by number of terms
    • 74 = 50 + 60+ 90 + x divided by 4
  64. Interest
    principle x rate x time
  65. Median?
    • median of a group of numbers is the middle term when the numbers are written in either ascending or descending order.
    • if two numbers are in the middle you take the mean (average) of two numbers
  66. mode
    number that occurs most frequently
  67. range?
    difference between the largest term and the smallest term
Author:
erica.kumar
ID:
2167
Card Set:
GRE review and prep
Updated:
2009-12-04 19:00:22
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GRE
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Description:
GRE prep and review
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