Difference between revisions of "Manuals/calci/PI"
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==References== | ==References== | ||
+ | [http://en.wikipedia.org/wiki/Pi Pi] |
Revision as of 04:17, 7 January 2014
PI()
Description
- This function gives the value of .
- The is a mathematical constant with a value approximate to 3.14159.
- It is denoted by the Greek letter .
- is commonly defined as the ratio of a circle's circumference to its diameter .
- So , the ratio is constant, and it is not considering the circle's size.
- is a transcendental number and irrational number.
- Being an irrational number, cannot be expressed exactly as a ratio of any two integers .
- But we can express as the fraction is approximate to the value , also no fraction can be its exact value.
Examples
- =Pi() = 3.141592653589793
- =Pi()/4 = 0.785398163
- =Pi()/180 = 0.017453293
- =Pi()/(22/7) = 0.999597663
- =Pi()*(5^2) = 78.53981634(Area of circle with r=5)
- =2*Pi()*5 = 31.41592654(Circumference of a circle with r=5).