Var
x1, x2, x3, x4, y1, y2, y3, y4: real;
function VectorLength(x1, y1, x2, y2: real): real;
begin
VectorLength := sqrt(sqr(x1 - x2) + sqr(y1 - y2));
end;
function VectorSlope(x1, y1, x2, y2: real): real;
begin
VectorSlope := (y1 - y2) / (x1 - x2);
end;
begin
readln(x1, y1);
readln(x2, y2);
readln(x3, y3);
readln(x4, y4);
if (VectorLength(x1, y1, x2, y2) = VectorLength(x4, y4, x3, y3))
and (VectorSlope(x1, y1, x2, y2) = VectorSlope(x4, y4, x3, y3)) then
writeln('Yes')
else writeln('No');
end.
Var r,s,b:real;
begin readln (b);
r:=b/2*(1+sqr(2));
s:=8*sqr(r)*sqr(3)-(sqr(2)*2);
writeln (r);
writeln(s);
<span>end.</span>
Var a:real;
begin
readln(a);
writeln(12*a*a+7*a-16);
<span>end.</span>