SOLUTION: How wide should a parabolic satellite dish be at its opening if the receiver (focus) is placed 6 feet away from the vertex and it is 12 feet deep at its center?
Algebra.Com
Question 1025783: How wide should a parabolic satellite dish be at its opening if the receiver (focus) is placed 6 feet away from the vertex and it is 12 feet deep at its center?
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
Imagine parabola with vertex at the origin on a coordinate system, and focus is (0,6). The directrix is the line (x,-6). You can derive the equation of the parabola according to the definition of a parabola and using the Distance Formula.
See and study this video for help on this: Derive equation for a parabola given focus and directrix, for vertex at Origin
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