Find the length of PQ :

A and B are centres of two circles of radii 11 cm and 6 cm, respectively. PQ is a direct common tangent to the circles, If AB=13 cm, then length of PQ will be

  1. 17 cm
  2. 12 cm
  3. 13 cm
  4. 8.5 cm
Anurag Mishra Professor Asked on 26th October 2015 in Maths.
Add Comment
1 Answer(s)

Answer: (2) 12 cm 

Explanation:-
According to the question,
In the figure –

RE: Find the length of PQ :


Common tangent CE = (132 – 52)1/2
= (169 – 24)1/2
= (144)1/2
= 12 cm
Then, the length of common tangent is 12 cm.

Hence, the answer is (2) 12 cm.

Anurag Mishra Professor Answered on 27th October 2015.
Add Comment

Your Answer

By posting your answer, you agree to the privacy policy and terms of service.