"Calculate the value of b in the triangle below." HELP PLZ WILL GIVE BRAINLIEST

Answer:
[tex]b { }^{2} = (61m) {}^{2} - (11m) {}^{2} [/tex]
[tex]b {}^{2} = 3721 - 121[/tex]
[tex]b {}^{2} = 3600[/tex]
[tex] \sqrt{b {}^{2} } = \sqrt{3600} [/tex]
[tex]b = 60[/tex]