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Programming: How to calculate pi
Problem:
Not every programming environment has a constant for pi defined. How can this value be calculated?
 
Solution:
If you have functions for basic trigonometry available, you can use the following formula:

pi = 4 * atan(1.0)

The atan() function returns the arc tangent in radians and the value is mathematically defined to be between -PI/2 and PI/2 (inclusive).

See "man 3 atan" for more info.
 
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