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|AC| = a pierwiastek3
a = AC/ pierwiastek 3 = 2a/pierwiastek3 = 20 pierwiastek3/ pierwiastek3*pierwiastek3 = 20 pierwiastek3/3
|AB| =2a
|AB| = 2 * 20pierwiastek3/3 = 40pierwiastek3/3
Pozdrawiam :)