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Three tangents to a parabola form a triangle. Where does the focus of the parabola lie with respect to that triangle?
AOn its circumcircle
BAt its centroid
CAt its orthocentre
DOn its incircle
Answer & Solution
Correct answer: A. On its circumcircle
Lambert's theorem says the focus is on the circumcircle of the triangle formed by any three tangents.
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