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ALLEGRO_PI(3)		    Library Functions Manual		   ALLEGRO_PI(3)

NAME
     ALLEGRO_PI - Allegro 5 API

SYNOPSIS
	    #include <allegro5/allegro.h>

	    #define ALLEGRO_PI	      3.14159265358979323846

DESCRIPTION
     C99  compilers  have  no predefined value like M_PI for the constant I, but
     you can use this one instead.

Allegro reference manual					   ALLEGRO_PI(3)

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<https://man.freebsd.org/cgi/man.cgi?query=ALLEGRO_PI&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>

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