How much do you know about London? Complete the sentences in writing
1. London, the capital of the UK, stands on the River
Thames.
2. The famous London double-decker is
in colour.
3. Big Ben is situated in
4. The National Gallery is situated
5. Whitehall is not a hall but a
in centrak London
6. The monument
to
is situated in the middle of Tyafalgar Square.
7 in London the Queen lives
an

function Len(x1,y1, x2, y2:real):real;

begin

   Len := sqrt( sqr(x1 - x2) + sqr(y1 - y2) );

end;

var

  x1,x2,x3,x4,x5, y1, y2, y3, y4, y5:real;

begin

   write('x1 = '); readln(x1);

   write('y1 = '); readln(y1);

   write('x2 = '); readln(x2);

   write('y2 = '); readln(y2);

   write('x3 = '); readln(x3);

   write('y3 = '); readln(y3);

   write('x4 = '); readln(x4);

   write('y4 = '); readln(y4);

   write('x5 = '); readln(x5);

   write('y5 = '); readln(y5);

   writeln('P = ', Len(x1,y1,x2,y2) + Len(x2,y2,x3,y3) + Len(x3,y3,x4,y4) + Len(x4,y4,x5,y5) + Len(x5,y5,x1,y1));

end.

function Len(x1,y1, x2, y2:real):real;

begin

   Len := sqrt( sqr(x1 - x2) + sqr(y1 - y2) );

end;

var

  x1,x2,x3,x4,x5, y1, y2, y3, y4, y5:real;

begin

   write('x1 = '); readln(x1);

   write('y1 = '); readln(y1);

   write('x2 = '); readln(x2);

   write('y2 = '); readln(y2);

   write('x3 = '); readln(x3);

   write('y3 = '); readln(y3);

   write('x4 = '); readln(x4);

   write('y4 = '); readln(y4);

   write('x5 = '); readln(x5);

   write('y5 = '); readln(y5);

   writeln('P = ', Len(x1,y1,x2,y2) + Len(x2,y2,x3,y3) + Len(x3,y3,x4,y4) + Len(x4,y4,x5,y5) + Len(x5,y5,x1,y1));

end.