Drawing Tangents to a Circle from a Point outside the Circle
Let d1 and ...
Question
Let d1 and d2 be the lengths of the perpendiculars drawn from foci S and S′ of the ellipse x2a2+y2b2=1 to the tangent at any point P on the ellipse. Then, SP:S′P=
A
d1:d2
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B
d2:d1
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C
d21:d22
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D
√d1:√d2
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Solution
The correct option is Dd1:d2 Triangles APS' and BPS are similar by light angle rule.