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b - drugi bok prostokąta
c - przekątna = b + 2 cm
a² + b² = c²
6² + b² = (b + 2)²
36 + b² = b² + 4b + 4
4b = 36 - 4
4b = 32
b = 32/4 = 8 cm
c = b + 2 cm = 8 cm + 2 cm = 10 cm
odp c = 10 cm