text: Area of a n | Java Program to find the area of a regular polygon with given side length ; Function to find the area of a regular polygon ; Side and side length cannot be negative ; Area degree converted to radians ; Driver code
code: import java . io . * ; class GFG { static float polyarea ( float n , float a ) { if ( a < 0 && n < 0 ) return - 1 ; float A = ( a * a * n ) / ( float ) ( 4 * Math . tan ( ( 180 / n ) * 3.14159 / 180 ) ) ; return A ; } public static void main ( String [ ] args ) { float a = 9 , n = 6 ; System . out . println ( polyarea ( n , a ) ) ; } }