krótszy bok = x
dłuższy bok = x+5cm
obwód = 15 dm=150 cm
2(x+x+5)=150
4x+10=150
4x=140
x=35
P = x*(x+5)
P= 35*40
P= 1400 cm²
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krótszy bok = x
dłuższy bok = x+5cm
obwód = 15 dm=150 cm
2(x+x+5)=150
4x+10=150
4x=140
x=35
P = x*(x+5)
P= 35*40
P= 1400 cm²