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20 P = 72cm kwadratowych
pole- 144 pierwiastków z 3 podzielic na 4 = 36 pierwiastków z 3
6²+ x² = 12²
36 + x² = 144 / - 36
x²= 104 /√
x = 2 √26
2√26 × 12
----------- = 12√26
2