If you get WA4 or WA5:

eps = 1e-6;
if (r1 + r2 == r3)
    print ((r1 - r4) * 2 + (r2 - r4) * 2);

If you get WA6:
WA: printf ("%.7lf", ans);
AC: printf ("%.3lf", ans);

if you get WA7 and etc your wrong in functions: asin, acos.

r1 r2 r3
r4
ans

10000 10000 10000
1
29996.536

30 70 40
2
136

4 5 1
1
8

2 2 4
2
0

5 5 8
1
14.227

30 32 15
10
25
47.076

5 5 6
3
5.760

5 5 6
6
0.000

5000 5000 8000
1
17996.205

25 35 30
2
83.245

1000 1000 2000
250
3000.000

234 34 240
1
504.433

1000 2000 1000
250
3500.000

thanks