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The areas of the primitive triangles of sides (a, b, c) and inradius, circumradius equals respectively to r and R are 672, 108000, ... The sides of the nonprimitive triangles are of the form (a*k^2, b*k^2, c*k^2) with r' = r*k^2 and R' = R*k^2 where r', R' are respectively the inradius and the circumradius of the nonprimitive triangles. The areas A' of the nonprimitive triangles are A' = A*k^4.
The area A of a triangle whose sides have lengths a, b, and c is given by Heron's formula: A = sqrt(s*(s-a)*(s-b)*(s-c)), where s = (a+b+c)/2. The inradius r is given by r = A/s and the circumradius is given by R = abc/4A.
The following table gives the first values (A, a, b, c, r, R).
+---------+------+------+------+-----+------+
| A | a | b | c | r | R |
+---------+------+------+------+-----+------+
| 168 | 14 | 30 | 40 | 4 | 25 |
| 2688 | 56 | 120 | 160 | 16 | 100 |
| 13608 | 126 | 270 | 360 | 36 | 225 |
| 43008 | 224 | 480 | 640 | 64 | 400 |
| 105000 | 350 | 750 | 1000 | 100 | 625 |
| 108000 | 480 | 510 | 510 | 144 | 289 |
| 217728 | 504 | 1080 | 1440 | 144 | 900 |
| 403368 | 686 | 1470 | 1960 | 196 | 1225 |
| 688128 | 896 | 1920 | 2560 | 256 | 1600 |
| 1102248 | 1134 | 2430 | 3240 | 324 | 2025 |
| 1680000 | 1400 | 3000 | 4000 | 400 | 2500 |
| 1728000 | 1920 | 2040 | 2040 | 576 | 1156 |
+---------+------+------+------+-----+------+
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