Brian
Level 41

# Math.PI in Java

## What is “pi” (π) in mathematics?

“The ratio of a circle’s circumference to its diameter i-e; 22/7 is represented by a constant value of 3.14159 is called “pi” in mathematics.”

## What is Math.PI in Java?

“Math.PI is a static final double constant in Java, equivalent to in π Mathematics.”
Provided by java.lang.Math class, Math.PI constant is used to carry out multiple mathematical and scientific calculations like finding the area & circumference of a circle or the surface area and volume of a sphere. In real life, the “pi” quantity has a fundamental position with never-ending uses. Some of them are listed below.
• Aerospace designers use pi to compute the area of the body of the aircraft.
• Medical Science benefits from pi by using it to analyze the structure of the eye.
• Biochemists use pi to study the composition of DNA.
• Statisticians use pi to project the population dynamics of the state.
• Pi has a core value in the current Global Positioning System (GPS) we have today.

### Example

If you want to learn how to get and how to use the value of Math.PI in Java let’s have a look at the following executable example.
``````
public class PiInJava {

public static double circumferenceOfCircle(int radius) {

return Math.PI * (2 * radius);
}

public static double areaOfCircle(int radius) {

}

public static double volumeOfSphere(int radius) {

return (4 / 3) * Math.PI * Math.pow(radius, 3);
}

public static double surfaceAreaOfSphere(int radius) {

return 4 * Math.PI * Math.pow(radius, 2);
}

public static void main(String[] args) {

System.out.println("Circumference of the Circle = " + circumferenceOfCircle(radius));
System.out.println("Area of the Circle = " + areaOfCircle(radius));
System.out.println("Volume of the Sphere = " + volumeOfSphere(radius));
System.out.println("Surface Area of the Sphere = " + surfaceAreaOfSphere(radius));

}

}
``````

### Output

Circumference of the Circle = 31.41592653589793 Area of the Circle = 78.53981633974483 Volume of the Sphere = 392.6990816987241 Surface Area of the Sphere = 314.1592653589793

## Conclusion

By now you must be familiar with the use of constant Math.PI in Java. Its application in Java is majorly based on your requirements & your sound understanding of its inherent mathematical value. Feel free to consult the article when you get stuck and like forever, keep practising and keep growing!