Mathematics
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http://en.wikipedia.org/wiki/Golden_ratio | http://en.wikipedia.org/wiki/Golden_ratio | ||
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+ | φ (pronounced “phi”) 1.61803398875… | ||
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+ | Equal to about 1.61803398875…, the irrational number φ is also known as the golden ratio or divine proportion. It is essential to geometry, and can be expressed as the ratio of a regular pentagon’s diagonal to the length of a side. Two numbers (say, a and b) are considered in the golden ratio if (a+b)/b = φ. | ||
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+ | ==e (pronounced “ee”)== | ||
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+ | Equal to about 2.71828182846..., e was discovered by Jacob Bernoulli, who first discovered it in a formula for calculating compound interest. | ||
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+ | ==√2 (pronounced “root two”)== | ||
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+ | Last and most venerable is the square root of 2 (written √2), which is equal to about 1.41421356237…Sometimes known as the Pythagorean constant, √2 is also the length of the hypotenuse of a right triangle, whose other sides both have length 1. | ||
==ref== | ==ref== |
Revision as of 01:09, 15 March 2015
This page is about Mathematics.
Contents |
Fibonacci Numbers
http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/fibnat.html#golden
Golden ratio
http://en.wikipedia.org/wiki/Golden_ratio
φ (pronounced “phi”) 1.61803398875…
Equal to about 1.61803398875…, the irrational number φ is also known as the golden ratio or divine proportion. It is essential to geometry, and can be expressed as the ratio of a regular pentagon’s diagonal to the length of a side. Two numbers (say, a and b) are considered in the golden ratio if (a+b)/b = φ.
e (pronounced “ee”)
Equal to about 2.71828182846..., e was discovered by Jacob Bernoulli, who first discovered it in a formula for calculating compound interest.
√2 (pronounced “root two”)
Last and most venerable is the square root of 2 (written √2), which is equal to about 1.41421356237…Sometimes known as the Pythagorean constant, √2 is also the length of the hypotenuse of a right triangle, whose other sides both have length 1.