Odpowiedź:
[tex]a)\ \ a=2\frac{1}{4}cm\ \ \ \ b=6cm\\\\Obw\'od=2a+2b=2\cdot2\frac{1}{4}+2\cdot6=\not2^1\cdot\frac{9}{\not4_{2}}+12=\frac{9}{2}+12=4\frac{1}{2}+12=16\frac{1}{2}=16,5cm\\\\\\b)\ \ a=13m\ \ \ \ b=8m\\\\Obw\'od=2a+2ab=2\cdot13+2\cdot8=26+16=42m[/tex]
