Answer :

Answer:

x = 5

Step-by-step explanation:

[tex]b = \sqrt{c^{2} - a^{2} }[/tex]

[tex]b = \sqrt{13^{2} - 12^{2} }[/tex]

[tex]b = \sqrt{169 - 144 }[/tex]

[tex]b = \sqrt{25}[/tex]

[tex]b = 5[/tex]

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