Question 1122681
{{{ cos(B) = 3/5 }}}
{{{ 3/5 = a/c }}}
{{{ 3/5 = 18/c }}}
{{{ c = (5/3)*18 }}}
{{{ c = 30 }}}
And
{{{ c^2 = a^2 + b^2 }}}
{{{ 30^2 = 18^2 + b^2 }}}
{{{ b^2 = 900 - 324 }}}
{{{ b^2 = 576 }}}
{{{ b = 24 }}}