the bisector of angle BAC of triangle ABC cuts BC at D and the circumcircle of the triangle at E, if DE=3cm ,AC=4 cm and AD=5 cm,then the length of AB is?

• AD can not be less than DE , because AD: DE = 2:1
  Incorrect question.
• 9 years agoHelpfull: Yes(2) No(4)
• Join BE¯¯¯¯¯¯¯¯. Using alternate segment theorem
  △(ACD)≡△(AEB).
  So,
  ACAD=AEAB.
  Solve. Ans is 10 cm
• 8 years agoHelpfull: Yes(2) No(1)
• Length of AB = 4, as DE=3 and AD = 5
  Then obvious AD >AB, hence the only choice is 4.
• 9 years agoHelpfull: Yes(0) No(2)