Finding the common chord length of circle X & sup2; + Y & sup2; - 4 = 0 and circle X & sup2; + Y & sup2; - 4x + 4Y = 0

Finding the common chord length of circle X & sup2; + Y & sup2; - 4 = 0 and circle X & sup2; + Y & sup2; - 4x + 4Y = 0

The two equations are combined into a system of equations and solved. The coordinates of the two intersections are obtained. Then the "formula of distance between two points" is used. = √ 14