If the circle $x^2+y^2+8 x-4 y+c=0$ touches the circle $x^2+y^2+2 x+4 y-11=0$ externally and cuts the circle $x^2+y^2-6 x+8 y+k=0$ orthogonally, then $\mathrm{k}=$

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If the circle $x^2+y^2+8 x-4 y+c=0$ touches the circle $x^2+y^2+2 x+4 y-11=0$ externally and cuts the circle…

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