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x² = 7² + 6²
x² = 49 + 36
x² = 85
x = √85
7² + 6² = c²
49 + 36 = c²
c² = 85
c= √85
a² = 36 + 49
a² = 85 |√
a = √85 odl. od pocz. układu wspołrzednych