Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

.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 | 28 Feb, 2013, 04:05: PM
answered-by-expert 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 | 28 Feb, 2013, 04:32: PM
CBSE 10 - Maths
Asked by ajabraosable27 | 11 Oct, 2021, 09:28: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by amikasangma080 | 11 Oct, 2021, 06:14: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by muskanmahek2411 | 08 Oct, 2021, 10:48: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by anishasheoran372 | 13 Jul, 2021, 09:33: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Asked by bhilarevishwesh | 21 May, 2021, 08:27: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Q30
question image
Asked by sangyaswarupa | 16 Mar, 2021, 10:06: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×