$C_1=x^2+y^2-4x-8y-5=0$ and $C_2=x^2+y^2-12x-2y+12=0$ are the equations of two given circles. The length of the common chord of $\mathrm{C}{1}$ and $\mathrm{C}{2}$ is:
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$C_1=x^2+y^2-4x-8y-5=0$ and $C_2=x^2+y^2-12x-2y+12=0$ are the equations of two given circles. The length of the common chord of $\mathrm{C}{1}$ and $\mathrm{C}{2}$ is: