JavaScript program to find area of a circle
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>
let pi = 3.14159265358979323846;
function findArea(r) {
return (pi * r * r);
}
let r, Area;
r = 5;
Area = findArea(r);
console.log( "Area of Circle is: " + Area);
</script>
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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>
function findArea(r) {
let pie_value = Math.PI;
return (pie_value * r * r);
}
let r, Area;
r = 5;
Area = findArea(r);
console.log( "Area of Circle is: " + Area);
</script>
|
Output:
Area of Circle is: 78.53981633974483
Last Updated :
29 Nov, 2022
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