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In this queation wich equation we use X^2 = 4ay or y^2 = 4ax and why ?

A paraboloid is formed by revolving a parabola about its axis . A spotlight in the form of a parabolid 5 inches deep has it's foucs 2 inches from the vertex . Find to one decimal place , the raduis R of the opening of the spotlight ....

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# Homework Help: Q in parabola

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