Please wait...
1800-212-7858 (Toll Free)
9:00am - 8:00pm IST all days

or

Thanks, You will receive a call shortly.
Customer Support

You are very important to us

For any content/service related issues please contact on this toll free number

022-62211530

Mon to Sat - 11 AM to 8 PM

.The Fig., shows two concentric circles with centre O. AB and APQ are tangents to the inner circle from point A lying on the outer circle. If AB=7.5 cm then find AQ

Asked by 28th February 2013, 4:05 PM
Answered by Expert
Answer:
Join OP. Now since, APQ is a tangent to the smaller circle so, OP = 90 degree. 
 
Since, the length of tangents drawn from a common point to a circle is equal
So, AB = AP
 
Also, in the bigger circle, AQ is the chord and OP is the perpendicular to the chord. 

Since, in a circle, a perpendicular drawn from the center of the circle to a chord bisects it. 
Therefore, AP = PQ. 
 
Hence, AQ = AP+PQ = 2*AP = 2* AB = 2*(7.5) = 15 cm
Answered by Expert 28th February 2013, 4:32 PM
Rate this answer
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

You have rated this answer /10

Your answer has been posted successfully!

Chat with us on WhatsApp