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:
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:
<script> let pi = 3.14159265358979323846;
// Function to calculate the area of circle
function findArea(r) {
return (pi * r * r);
}
// Driver code
let r, Area;
r = 5;
// Function calling
Area = findArea(r);
// 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:
<script> function findArea(r) {
let pie_value = Math.PI;
return (pie_value * r * r);
}
// Driver code
let r, Area;
r = 5;
// Function calling
Area = findArea(r);
// displaying the area
console.log( "Area of Circle is: " + Area);
</script> |
Output:
Area of Circle is: 78.53981633974483