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# p5.js | acos() function

• Last Updated : 10 Apr, 2019

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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