(i)
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Note only there can be one tangent at point P i.e. tangent XY If we try to make more than one line at point P example AB,it becomes a secant (as it intersects at more than one point)
(ii)
(iii)
Note only two tangents are possible AB and XYCD is not a tangent it is a secant as it intersects at 2 points
(iv)
Here P is the point of contact.