Известна плошадь окружности вычислить радиус фигуры

//---------------------------------------------------------------------------
 
#include <vcl.h>
#pragma hdrstop
 
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
const pi=3.14;
int p,x,m;
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
 
void __fastcall TForm1::BitBtn1Click(TObject *Sender)
{
 p=StrToInt(Edit1->Text);
 x=sqrt(p*pi);
 Edit2->Text=IntToStr(x);
}
//---------------------------------------------------------------------------
 
void __fastcall TForm1::SpeedButton1Click(TObject *Sender)
{
Close();
}
//---------------------------------------------------------------------------