Răspuns:
6.5 cm
Explicație pas cu pas:
[tex]A_l=2\pi rg\\2\pi rg=26\times 24\\\pi rg=26\times 12\\\pi r \times 24=26\times 12\\2\pi r=26\\\pi r=13\\r = \frac{13}{\pi}[/tex]
Aproximand..
[tex]\pi = 3.14\\r=\frac{13}{3.14}\\r=4.140cm[/tex]
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