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Mathematics 7 Online
OpenStudy (anonymous):

what is the definition of phi?

OpenStudy (hana88):

a plane angle it should be in the back of your book

OpenStudy (anonymous):

It also can be golden ratio. \[\phi = \frac{ 1+ \sqrt{5} }{ 2 }\] It has many meanings. http://en.wikipedia.org/wiki/Phi

OpenStudy (theviper):

http://en.wikipedia.org/wiki/Phi

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