Var
a, b: array [1..3] of real;
r: real;
begin
writeln('Введите углы (A, B, C), затем - радиус');
readln(a[1], a[2], a[3], r);
b[1] := r * 2 * sin(a[1]);
b[2] := r * 2 * sin(a[2]);
b[3] := r * 2 * sin(a[3]);
writeln('a = ', b[1]);
writeln('b = ', b[2]);
writeln('c = ', b[3]);
end.