Question

Two concentric circle of raduis a and b in which a is greater than b are given find the length of the chord of larger circle which touches the smaller circle

Answer 1

Let a be radius of larger circle and b be radii of smaller circle perpendicular to chord of larger circle

So,it forms a right triangle OAB
So, using Pythagoras theorem OA_√ab
So length of Chief is 2√ab as perpendicular from Contreras i.e radii bisect the chord