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a-3,5cm-krótszy bok
2a+2(a-3,5cm)=15cm
2a+2a-7cm=15cm
4a=15cm+7cm
4a=22cm/:4
a=5,5cm
a-3,5cm=5,5cm-3,5cm=2cm
P=5,5cm*2cm
P=11cm²-pole prostokąta
b - krotszy bok prostokata
P = a*b
2 + 2b = 15
a = b + 3,5
2b + 2(3,5 + b) = 15
2b+ 7 +2b = 15
4b = 8
b = 2
a =2 + 3,5 = 5,5
P =5,5*2 = 11 (cm²)