code: function(theta, rho) {
          this.x = Math.cos(theta) * rho;
          this.y = Math.sin(theta) * rho;
      }
docs: /*
  Method: setp
  
  Sets a polar number.
  
  Parameters:
  
  theta - A <Polar> number theta property.
  rho - A <Polar> number rho property.