# p5.js | tan() function

The tan() function in p5.js is used to calculate the tangent value of an angle in radians taken as the input parameter of the function.

Syntax:

`tan(angle)`

Parameters: This function accepts a single parameter angle which is an angle in radian whose tangent value is to be calculated.

Return Value: It returns the tangent value of an angle in radian taken as the input parameter.

Below program illustrates the tan() function in p5.js:

Example: This example uses tan() function to get tangent value of an angle in radian.

 `function` `setup() {  ` `  `  `    ``// Create Canvas of given size  ` `    ``createCanvas(550, 130);  ` `}  ` `  `  `function` `draw() {  ` `      `  `    ``// Set the background color  ` `    ``background(220);  ` `      `  `    ``// Initialize the parameter with ` `    ``// angles in radian only ` `    ``let a = 0;  ` `    ``let b = 8.9;  ` `    ``let c = 47; ` `    ``let d = 5; ` `      `  `    ``// Call to tan() function  ` `    ``let v = tan(a); ` `    ``let w = tan(b); ` `    ``let x = tan(c); ` `    ``let y = tan(d); ` `      `  `    ``// Set the size of text  ` `    ``textSize(16);  ` `      `  `    ``// Set the text color  ` `    ``fill(color(``'red'``));  ` `    `  `    ``// Getting tangent value  ` `    ``text(``"Tangent value of angle 0 (in radian) is : "` `+ v, 50, 30); ` `    ``text(``"Tangent value of angle 8.9 (in radian) is : "` `+ w, 50, 50); ` `    ``text(``"Tangent value of angle 47 (in radian) is : "` `+ x, 50, 70); ` `    ``text(``"Tangent value of angle 5 (in radian) is : "` `+ y, 50, 90);      ` `}  `

Output:

Note: In the above code, the input angle should be in radian. For converting the degree into radian use the following formula:

`Angles_in_radian = (π/180)*angles_in_degree`

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

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