import java.util.*;
import java.lang.*;
import java.io.*;
class Brovko
{
{
double a,b,c,p,h;
Scanner in
= new Scanner
(System.
in); a=in.nextDouble();
b=in.nextDouble();
c=in.nextDouble();
if (a<=0 || b<=0 || c<=0)
{
System.
out.
println("Ошибка в условии.Одна из сторон равна или меньше 0. \n"); }
else if ((a+b)-c<=0 || (a+c)-b<=0 || (b+c)-a<=0)
{
System.
out.
println("Ошибка в условии. Сумма двух сторон равна или меньше третьей стороны. \n"); }
else
{
p=(a+b+c)/2;
h
=2*Math.
sqrt(p
*(p
-a
)*(p
-c
)*(p
-b
))/b
; System.
out.
format("h = %f",h
); }
}
}
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