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# How to get the perimeter of a circle in Java

okwudili onyejiaku

### Overview

The perimeter of a circle is its boundary or the total distance around a circle. The term that denotes the perimeter is called the circumference of a circle. Mathematically, the perimeter of a circle is 2*Pi*radius.

### Syntax

2 * PI * radius
Syntax of perimeter of a circle in Java

### Parameters

• PI: This is the mathematical pi. It is equal to 3.14.
• radius : This is the radius of the circle.

### Return value

The value returned is a float value.

### Example

import java.lang.Math;
class HelloWorld {
public static void main( String args[] ) {
// create some radii
float rad1 = 3;
float rad2 = 45;
float rad3 = 1.5F;
float rad4 = 0.1F;

// get the perimeter of cricles
double per1 = 2 * Math.PI * rad1;
double per2 = 2 * Math.PI * rad2;
double per3 = 2 * Math.PI * rad3;
double per4 = 2 * Math.PI * rad4;

// print the perimeters
System.out.println("The perimeter of circle with radius "+rad1+" is: "+per1);
System.out.println("The perimeter of circle with radius "+rad2+" is: "+per2);
System.out.println("The perimeter of circle with radius "+rad3+" is: "+per3);
System.out.println("The perimeter of circle with radius "+rad4+" is: "+per4);
}
}
Get the perimeter of a circle in Java

### Explanation

• Line 1: We import the Math module.
• Lines 5–8: We create some radius values.
• Lines 11–14: We get the perimeter of circles with the radius created.
• Lines 17–20: We print the perimeters.

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okwudili onyejiaku
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