Discussion
A tangent to a conic at a point on the curve is drawn perpendicular to the
Answer: B
Correct answer: normal at that point
The normal is by definition perpendicular to the tangent, so constructing one gives the other. In practice the normal is often easier to find first - for an ellipse it bisects the angle between the focal radii, and for a parabola it can be located from the focus and directrix - and the tangent is then drawn at right angles to it.
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