📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!

  • google app store apple app store

    • Question

      The internal bisector of ∆ABC at ∠A cuts BC on D and

      cuts the circumcircle at E. If DE = 6cm, AC = 8cm and AD = 10 cm, then find the length of AB?
      A 32 cm Correct Answer Incorrect Answer
      B 18 cm Correct Answer Incorrect Answer
      C 15 cm Correct Answer Incorrect Answer
      D 20 cm Correct Answer Incorrect Answer

      Solution

      Join EC,  From the diagram, AE = AD + DE  AE = 10 + 6 = 16 cm  ∠ABC = ∠ CEA (Similar Chord Theorem,  In, ∆ADB and ∆AEC, (AB )/(AE )=(AD )/(AC )               (Similar triangle) (AB )/(16  )=(10  )/(8  )      AB = 20 cm 

      Practice Next
      ask-question