PA and PB are tangent to the circle at A and B respectively and the chord BC is parallel to tangent PA.If AC=6 cm and lenght of tangent AP is 9 cm.Then what is the length of the chord BC.

• PA = PB = 9 cm ( Length of tangents from an external point)
  
  Angle PAB = Angle ABC ( alternate angles PA !! BC)
  
  AC = AB = 6 cm
  
  Triangles PAB and ACB are Isoscelles and sre similar triangles
  
  ( They are equiangular)
  
  Taking the ratios of respective sides
  
  BC/AB = AC/PB
  
  BC/6 = 6/9
  
  BC = 4 cm
• 9 years agoHelpfull: Yes(4) No(0)
• plz give ans .how to solve this ?
  
• 9 years agoHelpfull: Yes(1) No(0)
• 9.....
  because PA opposite side is BC and PB opposite side is AC which forms a square.
  So ans is 9
  
  
• 9 years agoHelpfull: Yes(1) No(5)
• Sandeep...Bro..I didn't get ur logic..can u please explain...
• 9 years agoHelpfull: Yes(0) No(0)
• I feel 9 is correct ans
• 9 years agoHelpfull: Yes(0) No(0)