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p - przekątna = a√2 = 1,2 cm
a√2 = 1,2
a = 1,2 : √2 = 1,2√2 : √2 * √2 = 1,2√2/2 = 0,6√2 cm
P - pole kwadratu = a² = (0,6√2)² = 0,36 * 2 = 0,72 cm²