Answer:
The answer is "25".
Step-by-step explanation:
Please find the graph in the attachment.
[tex]Longest \ side= 12[/tex]
Calculating the triangle two other sides:
[tex]=\sqrt{3^2+6^2}\\\\=(9+36)\\\\=45[/tex]
let
[tex]\to \sqrt{45}= 6.7.\\\\\to 6.7\times 2=13.4\\\\\to 13.4+12=25.4 \approx 25[/tex]