Given that the straight line m passes through a focal point of the ellipse x ^ 2 / 5 + y ^ 2 / 4 = 1 and is perpendicular to the X axis, the chord length of the straight line m cut by the ellipse is obtained

One of the focal coordinates of the ellipse is (1,0), which brings x = 1 into y = 4 √ 5 / 5 of the elliptic equation, so the chord length is equal to L = 2Y = 8 √ 5 / 5

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