Respuesta :

Solution

For this case we can do the follwong:

For this case we can do the following proportion rule:

[tex]\frac{3}{12}=\frac{b}{20}[/tex]

Where b is the longest side and solving we got:

[tex]b=20\cdot\frac{3}{12}=5[/tex]

The final answer is 5

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