Difference between revisions of "Pi"
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π (greek letter pi) is the ratio of the circumference of a circle to its diameter. | π (greek letter pi) is the ratio of the circumference of a circle to its diameter. | ||
| − | π is about < | + | π is about <syntaxhighlight lang="pascal" enclose="none">3.14159265358979</syntaxhighlight>. |
| − | A full circle has < | + | A full circle has <syntaxhighlight lang="pascal" enclose="none">2*pi()</syntaxhighlight> [[Radian|radians]]. |
| − | In [[Pascal]], < | + | In [[Free Pascal|Free Pascal's]] [[RTL]], <syntaxhighlight lang="pascal" enclose="none">system.pi</syntaxhighlight> is a [[Function|<syntaxhighlight lang="pascal" enclose="none">function</syntaxhighlight>]] which returns the value of π. |
| − | This | + | This allows you to assign <syntaxhighlight lang="pascal" enclose="none">addr(system.pi)</syntaxhighlight> to a procedural variable. |
| − | < | + | <syntaxhighlight lang="pascal" enclose="none">pi()/4</syntaxhighlight> is the same as <syntaxhighlight lang="pascal" enclose="none">arctan(1)</syntaxhighlight>. |
== See also == | == See also == | ||
| − | * {{Doc|package=RTL|unit=system|identifier=pi|text=< | + | * {{Doc|package=RTL|unit=system|identifier=pi|text=<syntaxhighlight lang="pascal" enclose="none">system.pi</syntaxhighlight>}} |
| − | * {{Doc|package=RTL|unit=system|identifier=arctan|text=< | + | * {{Doc|package=RTL|unit=system|identifier=arctan|text=<syntaxhighlight lang="pascal" enclose="none">system.arctan</syntaxhighlight>}} calculates arc tangent. |
Revision as of 13:24, 14 May 2018
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π (greek letter pi) is the ratio of the circumference of a circle to its diameter.
π is about 3.14159265358979.
A full circle has 2*pi() radians.
In Free Pascal's RTL, system.pi is a function which returns the value of π.
This allows you to assign addr(system.pi) to a procedural variable.
pi()/4 is the same as arctan(1).
See also
system.pisystem.arctancalculates arc tangent.
