On a parabola, the line segment through the focus,
Chapter 10, Problem 10.8.1(choose chapter or problem)
On a parabola, the line segment through the focus, perpendicular to the axis, and intercepted by the parabola is called the focal chord or latus rectum. The length of the focal chord is called the focal width. Find a formula for the focal width w in terms of the focal length .
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