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GRE Quantitative Concepts
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Acute triangles
a^2 + b^2 is greater than c^2
c is the longest side of the triangle
Obtuse triangles
a^2 + b^2 is less than c^2
c is the longest side
100 + 289 is less than 441
Right triangles
a^2 + b^2 = c^2
c is the longest side
9 + 16 = 25
25 + 144 = 169
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
45-45-90 right triangle side lengths
sides are x, x, and x√2
30-60-90 right triangle
sides are x, x√3, and 2x
Triangle inequality
The sum of the lenghts of nay two sides is _______ than the length of the third side
Greater
Equalateral triangle formula
Area = (s^2 √3)/4
Author
Anonymous
ID
59371
Card Set
GRE Quantitative Concepts
Description
Math concepts
Updated
2011-01-12T15:58:29Z
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