Tangent Lines - GMAT Quantitative

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Question

Find the slope of the line tangent to circle at the point .

I) Circle has a radius of units.

II) The area of circle f is .

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Answer

In this case, I and II give us a ton of information about the size of the circle, but we have no clue as to its location.

In order to know the slope of the tangent line, we need to know location of the circle, so we cannot solve this problem.

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