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GRE: Math2

GRE Math2 Flashcards - Most Studied - #7,9,10,12 I deleted ones that didn't make sense
Kalvin
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  • If y is directly proportional to x, what does it equal?
    y/x is a constant
  • What is a percent?
    A percent is a fraction whose denominator is 100.
  • #1 What is an important property of a 30-60-90 triangle?
    • The triangle is a right triangle.
  • #2 What is an important property of a 30-60-90 triangle?
    • The hypotenuse is twice the length of the shorter leg.
  • #3 What is an important property of a 30-60-90 triangle?
    The ratio of the length of the three sides is x:x√3:2x
  • The negative exponent x⁻ⁿ is equivalent to what?
    1/xⁿ i.e. 5^-3 = 1/(5^3) = 1/ 125 = .008
  • formula for area of a triangle
    A=½bh
  • formula for volume of a rectangular solid
    V=l×w×h
  • formula for the volume of a cube
    V=side³
  • #1 What are the important properties of a 45-45-90 triangle?
    • The triangle is a right triangle.
  • #2 What are the important properties of a 45-45-90 triangle?
    • The triangle is isosceles (AC=BC).
  • #3 What are the important properties of a 45-45-90 triangle?
    • The ratio of the lengths of the three sides is x:x:x√2.
  • formula for distance problems
    distance=rate×time or d=rt
  • A quadrilateral where two diagonals bisect each other
    Parallelogram
  • In a rectangle, all angles are
    Right
  • In a Rectangle, each angles measures
    90°
  • The Perimeter of a rectangle
    P=2(l+w)
  • Area of a Parallelogram:
    A=(base)(height)
  • (x-y)(x+y)
    x²-y²
  • (x-y)²
    x²-2xy+y²
  • (x+y)² x²+2xy+y²
    x²+2xy+y²
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