Area and volume of various geometrical figures

public class AreaVol{
 public static void main(String [] args){
  double lr=3, wr=2, hr=0.5, ar=0, vr=0;
  ar=lr*wr;
  System.out.println("Area of rectangle="+ar);
  vr=lr*wr*hr;
  System.out.println("Volume of rectangle="+vr);

  double bt=2, ht=3.2, at=0;
  at=bt*(ht/2);
  System.out.println("\nArea of triangle="+at);

  double pi=3.1416, rc=3.7, ac=0;
  ac=pi*rc*rc;
  System.out.println("\nArea of circle="+ac);

  double rade1=3, rade2=3.75, ae=0;
  ae=pi*rade1*rade2;
  System.out.println("\nArea of Ellipse="+ae);

  double sideSq=3.6, aSq=0;
  aSq=sideSq*sideSq;
  System.out.println("\nArea of Square="+aSq);

  double hTr=2.6,base1Tr=3.4,base2Tr=4.8,aTr=0;
  aTr=hTr*((base1Tr+base2Tr)/2);
  System.out.println("\nArea of trapezoid="+aTr);

  double diag1r=3, diag2r=9, adiag=0;
  adiag=(diag1r*diag2r)/2;
  System.out.println("\nArea of Rhombus="+adiag);

  double rSphr=5.3, aSphr=0, vSphr=0;
  aSphr=4*pi*rSphr*rSphr;
  System.out.println("\nArea of Sphere="+aSphr);
  vSphr=(4*pi*rSphr*rSphr*rSphr)/3;
  System.out.println("Volume of Sphere="+vSphr);

  double rCyl=2.3, hCyl=5.6, aCyl=0, vCyl=0;
  aCyl=2*pi*rCyl*hCyl+2*pi*rCyl*rCyl;
  System.out.println("\nArea of Sphere="+aCyl);
  vCyl=pi*rCyl*rCyl*hCyl;
  System.out.println("Volume of Cylinder="+vCyl);
  }
}