Question

Line PA and line PB are two tangents drawn from a common exterior point circle(o,r) . a third tangent line CD is drawn such that it touches the
circle(o,r) at Q and A-C-p and B-d-p Ap=8.5 ,dq=3.5,dp=_____

Answer 1

dp will be equal to pb + bd 

now pb = 8.5 and bd = 3.5

therefor pb= 8.5+3.5=12 

ans=12