2x + 1 + x + x + 5 = 30
4x + 6 = 30
4x = 24
x = 6
2x + 1 = 2 · 6 + 1 = 13
x + 5 = 6 + 5 = 11
Długości boków:
6, 11, 13
(x + 4) · 3 = 30
3x + 12 = 30
3x = 18
x + 4 = 6 + 4 = 10
wszystkie po 10