面积是周长根号2倍的海轮三角形
SQL> c/16/8
3* where power(a.n+b.n+c.n,2)=(a.n+b.n+c.n)*(a.n-b.n+c.n)*(a.n+b.n-c.n)*(-a.n+b.n+c.n)/8
SQL> /
N N N
------------ ------------ ------------
6 6 4
9 6 5
11 9 4
Elapsed: 00:00:00.21
面积是周长2倍
SQL> c/64/32
3* where power(a.n+b.n+c.n,2)=(a.n+b.n+c.n)*(a.n-b.n+c.n)*(a.n+b.n-c.n)*(-a.n+b.n+c.n)/32
SQL> /
N N N
------------ ------------ ------------
11 10 9
12 12 8
18 12 10
18 17 7
19 14 9
22 18 8
33 18 17
33 30 7
34 21 15
38 27 13
43 33 12
11 rows selected.
面积是周长4倍
SQL> c/4/64
3* where power(a.n+b.n+c.n,2)=(a.n+b.n+c.n)*(a.n-b.n+c.n)*(a.n+b.n-c.n)*(-a.n+b.n+c.n)/64
SQL> /
N N N
------------ ------------ ------------
15 14 13
20 16 12
24 15 15
26 24 10
30 25 11
34 20 18
37 26 15
39 35 10
40 30 14
41 40 9
10 rows selected.
Elapsed: 00:00:00.43