This solution will guide you through finding the length of a focal chord of a parabola. We'll break down the problem into clear, manageable steps, explaining the mathematical reasoning behind each action.

Key Concepts and Formulas:

1. Standard Form of a Parabola: For a parabola with its axis parallel to the x-axis, the standard form is $(y-k)^2 = 4a(x-h)$, where $(h,k)$ is the vertex and $a$ is the focal length. The focus of such a parabola is located at $(h+a, k)$.
2. Focal Chord: A chord of a parabola that passes through its focus.
3. Length of a Focal Chord: For a parabola