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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 , 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+14.3.quarterly>

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