how to program a program to calculate the area and the perimetre of a circle?
pls answer me asap i need to know quickly
thank you!

how to program a program to calculate the area and the perimetre of a circle?
pls answer me asap i need to know quickly
thank you!

Then you better start showing some effort ASAP. Post your code and any problems you are facing.

main()
{
  int rad, mypi=3.14;
  int area, perimeter;
  cout<<"radian";
  cin>>rad;
  cout<<"mypi=3.14";
  cin>>mypi=3.14;
  perimeter=(2*mypi=3.14*rad);
  area=mypi=3.14*rad*rad
  cout<<"the perimeter is: <<perm<<endl;
  cout<<"the area is: <<area<<endl;
}

so i don't know what's wrong,, also i don't know if i have to write "float mypi=3.14 at th beginnig or not
thank you

The formula for calculating the area of a circle is pi*(radius*radius).
You can declare pi as a const double and set it equal to 3.14. So you need to have a variable for radius. Then simply put all the values into the formula.
Also use code tags when posting code.