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 & inersects the radius drawn from a point of contact at the midpoint of the radius .If AB=12,FIND THE RADIUS OF THE CIRCLE.

- geometry -
**Mahek**, Thursday, July 14, 2011 at 2:42am
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.

- geometry -
**Reiny**, Thursday, July 14, 2011 at 9:14am
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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