# p5.js | acos() function

The acos() function in p5.js is used to calculate the arc cosine value. The domain of this function is -1 to +1 and the range is 0 to 3.14.

Syntax:

`acos(c)`

Parameters: This function accepts single parameter c which stores the value in between -1 to 1.

Below programs illustrate the acos() function in p5.js:

Example 1: This example uses acos() function to calculate arc cosine value.

 `function` `setup() { ` ` `  `    ``// Create Canvas of size 380*80 ` `    ``createCanvas(380, 80); ` `} ` ` `  `function` `draw() { ` `     `  `    ``// Set the background color ` `    ``background(220); ` `     `  `    ``// Set the angle in radian ` `    ``let angle = PI; ` `     `  `    ``// Compute value of cos() ` `    ``let c = cos(angle); ` ` `  `    ``// Compute value of acos() ` `    ``// It returns the value of PI ` `    ``let ac = acos(c); ` `     `  `    ``// Set the font size ` `    ``textSize(16); ` `     `  `    ``// Set the font color ` `    ``fill(color(``'red'``)); ` `     `  `    ``// Display result ` `    ``text(``"Value of acos is : "` `+ ac, 50, 30); ` `} `

Output:

Example 2: This example uses acos() function to calculate arc cosine value.

 `function` `setup() { ` ` `  `    ``// Create Canvas of given size ` `createCanvas(380, 80); ` `} ` ` `  `function` `draw() { ` `     `  `    ``// Set the background color ` `    ``background(220); ` `     `  `    ``let c = 0.5; ` `     `  `    ``// Use acos() function to calculate ` `    ``// arc cosine value ` `    ``let ac = acos(c); ` `     `  `    ``// Set font size ` `    ``textSize(16); ` `     `  `    ``// Set font color ` `    ``fill(color(``'red'``)); ` `     `  `    ``// Display result ` `    ``text(``"Value of acos is : "` `+ ac, 50, 30); ` `} `

Output:

Reference: https://p5js.org/reference/#/p5/acos

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