GRE Quantitative Concepts

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Author:
Anonymous
ID:
59371
Filename:
GRE Quantitative Concepts
Updated:
2011-01-12 10:58:29
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GRE
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Description:
Math concepts
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  1. Acute triangles
    a^2 + b^2 is greater than c^2

    c is the longest side of the triangle
  2. Obtuse triangles
    a^2 + b^2 is less than c^2

    • c is the longest side

    100 + 289 is less than 441
  3. Right triangles
    a^2 + b^2 = c^2

    c is the longest side



    9 + 16 = 25

    25 + 144 = 169
  4. More right triangle facts
    for any positive number x, there is a right triangle whose sides are 3x, 4x, and 5x

    ie x=pi

    3pi, 4pi, and 5pi
  5. 45-45-90 right triangle side lengths
    • sides are x, x, and x√2
  6. 30-60-90 right triangle
  7. sides are x, x√3, and 2x
  8. Triangle inequality

    The sum of the lenghts of nay two sides is _______ than the length of the third side
    Greater
  9. Equalateral triangle formula
    • Area = (s^2 √3)/4

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