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x-3,5 - długość krótszego boku
O = 15 cm
O = 2*x + 2*(x-3,5) = 15
2x + 2x - 7 = 15
4x = 15+7
4x = 22 |:4
x = 5,5 cm
x - 3,5 = 5,5-3,5 = 2 cm
P = 5,5 * 2 = 11 cm²
Pole prostokąta wynosi 11 cm²