A cone is a three-dimensional geometric shape. It consists of a base having the shape of a circle and a curved side (the lateral surface) ending up in a tip called the apex or vertex. We will be going to learn how can we calculate it by using JavaScript.

Formula used:

Curved Surface area of a Cone = πrl

Examples:

Input: radius = 0.8, slant height = 20
Output: Curved Surface Area = 50.26548245743669
 
Input: radius = 0.2, slant height = 5
Output: Curved Surface Area = 3.141592653589793

Approach

• A function named CurvedSurfaceAreaofCone is defined, which takes the radius and slant height as two parameters.
• The function proceeds to calculate the Curved Surface Area of the Cone using the formula (Π  * r * l). Where ‘r’ is the radius of the base2. ‘l’ is the slant height of the cone.
• The calculated Curved Surface Area is returned as the result of the function.

Example: Below is the function to find the Curved Surface Area of the Cone:

// Javascript program to find 
// Curved Surface area of Cone 

function CurvedSurfaceAreaofCone(r, l) {
    return (Math.PI * r * l);
}

let r = 0.8;
let l = 20;
let output = CurvedSurfaceAreaofCone(r, l);
console.log(output) 

50.26548245743669

Time complexity: O(1), as the execution time is constant and does not grow with the size of the input.

Auxiliary Space complexity: O(1) as it uses a constant amount of memory regardless of the input size.