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A cross-section of a parabolic reflector is shown in the figure. The bulb is located at the focus and the opening at the focus is

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A cross-section of a parabolic reflector is shown in the figure. The bulb is located at the focus and the opening at the focus is 6 cm. A X B D (a) Find an equation of the parabola. (b) Find the diameter of the opening |CD|, 11 cm from the vertex. cm

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