Given that B and C are two fixed points,|BC|=6, and the circumference of △ABC is equal to 16, the trajectory equation of vertex A is ______.

Given that B, C are two fixed points, the absolute value BC is equal to 8, and the perimeter of triangle ABC is equal to 18, find the trajectory equation of vertex A Calculated as (x^2)/25+(y^2)/9=1. But the answer is (y =0) Please ask why y can not be equal to 0

When y =0, point A is (-5,0) or (5,0) on the coordinate axis, which can not form a triangle, so y can not be equal to 0.

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