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

P and Q are centres of circles with radii 9cm and 2cm respectively. PQ=17cm.R is centre of the circle of radius xcm which touches the above circles externally. PQR= 90° 

Asked by Usha 2nd February 2018, 2:33 PM
Answered by Expert
Answer:
begin mathsize 16px style increment PQR comma
PQ squared equals PR squared plus RQ squared
17 squared equals left parenthesis straight y plus 9 right parenthesis squared plus left parenthesis straight y plus 2 right parenthesis squared
289 equals straight y squared plus 18 straight y plus 81 plus straight y squared plus 4 straight y plus 4
2 straight y squared plus 22 straight y minus 204 equals 0
straight y squared plus 11 straight y minus 102 equals 0
left parenthesis straight y minus 6 right parenthesis left parenthesis straight y plus 17 right parenthesis equals 0
As space straight y not equal to 0 rightwards double arrow straight y equals 6 end style
Answered by Expert 3rd February 2018, 7:55 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!