Posted by Mahek on Thursday, July 14, 2011 at 1:54am.
In a circle with centre P,a chord AB is parallel to a tangent & intersects the radius drawn from a point of contact at the midpoint of the radius .If AB=12,FIND THE RADIUS OF THE CIRCLE.
let the radius be 2x
then I see a right-angled triangle with sides x , 6 and hypotenuse 2x
(2x)^2 = x^2 + 6^2
3x^2 = 36
x^2 = 12
x = √12 = 2√3
so the radius is 4√3
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