With this function you can get the number PI.
This is done like this: acos(-1) === M_PI
acos
(PHP 4, PHP 5, PHP 7)
acos — Arco coseno
Descripción
acos
( float
$arg
) : float
Devuelve el arco coseno de arg en radianes.
acos() es la función complementaria de
cos(), lo que quiere decir que
a==cos(acos(a)) para cada valor de a en el rango de
acos()'.
Parámetros
-
arg -
El argumento a procesar
Valores devueltos
The arc cosine of arg in radians.
add a note
User Contributed Notes 2 notes
nurlanovic at gmail dot com ¶
1 year ago
zoltan dot szentesi at nokia dot com ¶
12 years ago
Wondering what is the use of 'acos' function?
It is essential in games, animations and drawings to determine the location of two objects relating to each other.
To the point: the angle of two vectors is calculated by
v1X*v2X + v1Y*v2Y
acos(--------------------------)=angle between two vectors.
|v1| * |v2|
|v1| and |v2| are the length of the vectors and calculated using Pithagoras-formula: |v1|=sqrt(v1X*v1X + v1Y*v1Y)
This helped me to calculate and share given space for 'n' amount of objects so that they don't overlap.
Enjoy! :-)
