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Given points, A, B, C, and D lie in and on the ellipse, and the relation they hold is AB + BC = AD + CD, in which two points lie on the curve. Find the focus points of the ellipse?

Given points, A, B, C, and D lie in and on the ellipse, and the relation they hold is AB + BC = AD + CD, in which two points lie on the curve. Find the focus points of the ellipse? Correct Answer A, C

In an ellipse, all the points on the curve have a constant sum of the distance from the focus points. Hence A and C are two focus of the ellipse. And B and D lie on the curve, hence AB + BC = AD + CD.

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