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a=5
b=9
AB = a² + b² = c²
(2,5)² + (4,5)² = c²
6,25 + 20,25 = c²
c² = 26,5
c = 5,14
P = a²
P = (5,14)²
P = 26,5
Odp. Pole tego czworokąta wynosi 26,5 cm².