Pascal system . write the program that will calculate the perimeter of a rectangle if its area is A (m²) and one of its sides has a length of B (m). A and B are entered from the keyboard.​

The program in Pascal is as follows:

Program Perimeter;

Uses Crt;

Var

 Length : Real;

 Width : Real;

 Area    : Real;

 Perim : Real;

Begin

 Clrscr;

 Write('Area: ');

 Readln(Area);

 Write('Length : ');

 Readln(Length);

 Width := Area/Length;

 Perim := 2 * (Length + Width);

 Write('Perimeter: ' ,Perim:5:2,'.');

End.

Explanation:

This declares all variables as real

Var

 Length : Real;

 Width : Real;

 Area    : Real;

 Perim : Real;

The program execution begins here

Begin

This clears the screen

 Clrscr;

This prompts the user for Area

 Write('Area: ');

This gets input for Area

 Readln(Area);

This prompts the user for Length

 Write('Length : ');

This gets input for Length

 Readln(Length);

This calculates the width

 Width := Area/Length;

This calculates the perimeter

 Perim := 2 * (Length + Width);

This prints the calculated perimeter

 Write('Perimeter: ' ,Perim:5:2,'.');

This ends the program

End.

that without the operating systems you would have to control and synchronize computer hardware.