Find the length of the common chord of the two circles x2+y2−4x=0x^2 + y^2 - 4x = 0x2+y2−4x=0 and x2+y2−4y=0x^2 + y^2 - 4y = 0x2+y2−4y=0.
222
222\sqrt{2}22
2\sqrt{2}2
444