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d₂ = 18 cm
7.5 : 2 = 3.75 cm
18 : 2 = 9 cm
a² + b² = c²
3.75² + 9² = c²
14.0625 + 81 = c²
c² = 95.0625 cm
c = 9.75 cm
Odp. Długość boku wynosi 9.75 cm
9*9+3.75*3.75=x do kwadratu
x=9,75
Dlugość boku rombu wynosi 9,75 cm :)