Table of Contents
Java is used extensively in mathematics because of how easy it is to perform calculations across different platforms.
One of the most common calculations is to calculate the area of a circle.
In this post, we'll learn how to calculate the area of a circle in Java.
How to calculate the area of a circle
The formula to calculate the area of a circle is well-known, it is πr²
.
Meaning we just take the radius of the circle and multiply it by itself, and then multiply it by pi
.
Thankfully, we can use pi
in Java by using the Math.PI
constant.
Let's first start off with the example code:
JAVAdouble radius = 5;
double area = Math.PI * radius * radius;
System.out.println(area);
BASH78.53981633974483
Now, we can turn this into a re-usable method that accepts a radius as the parameter:
JAVApublic static double calculateArea(double radius) {
return Math.PI * radius * radius;
}
Now we can just call this method:
JAVAdouble area = calculateArea(5);
System.out.println(area);
BASH78.53981633974483
Either way, it is very easy to calculate the area of a circle, and this reusable method can be used in any Java program.
Conclusion
In this post, we learned how to calculate the area of a circle in Java.
Simply apply the formula πr²
with your desired radius and you'll get the area of the circle.
Thanks for reading and happy coding!
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