Conic Sections...A radio telescope has a parabolic dish, with its receiver near...

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Nicole

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...the focus of the parabola? A radio telescope has a parabolic dish, with its receiver near the focus of the parabola. If the dish has a diameter of 85 meters and the focus is 35 meters from the vertex of the dish, how deep is the dish?

HOW do I begin to do this?
 
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