Given the radius of a circle, find the area of that circle. The area of a circle can simply be evaluated using the following formula:
Area of circle
Where r is the radius of the circle and it may be in float because the value of the pie is 3.14
Approach: Using the given radius, find the area using the above formula: (pi * r * r) and print the result in float.
Example: Below is the example that will illustrate the program to find area of a circle:
Javascript
<script>Â Â Â Â let pi = 3.14159265358979323846;Â
    // Function to calculate the area of circle     function findArea(r) {        return (pi * r * r);    }Â
    // Driver code     let r, Area;    r = 5;Â
    // Function calling     Area = findArea(r);Â
    // displaying the area     console.log("Area of Circle is: " + Area);</script> |
Output:
Area of Circle is: 78.53981633974483
Time Complexity: O(1).
Auxiliary Space: O(1), since no extra space has been taken.
Another Approach: Using Math.Pi
We can get the value of pi using the Math module in javascript
Below is the Implementation:
Javascript
<script>Â
  function findArea(r) {          let pie_value = Math.PI;          return (pie_value * r * r);   }Â
  // Driver code   let r, Area;  r = 5;Â
  // Function calling   Area = findArea(r);Â
  // displaying the area   console.log("Area of Circle is: " + Area);Â
</script> |
Output:
Area of Circle is: 78.53981633974483
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