Fri February 15, 2013 By:

The tangent is drawn from point T on the circle to external point P,line segment is drawn fron point P to B point on a circle passing through point A on a circle.Such that PA=4cm,AB=9cm,then value of PT is.

Expert Reply
Fri February 15, 2013
If PAB is a secant to a circle intersecting it at A and B and PT is a tangent then PA.PB = PT2
So, PT2 = PA.PB = 4x(4+9) = 52
since PB=PA+AB
so, PT = 
Ask the Expert