Which of the statements given below is/are not correct? 1. 'Open' is an Autobiography of Andre Agassi. 2. The author of 'India 2020: A Vision for the New Millennium'A.P.J. Abdul Kalam. 3. The author of 'A Foreign Policy For India' is L.K Advani.
If a chord of a circle subtends an angle of 30° at the circumference of the circle, then what is the ratio of the radius of the circle and the length of the chord respectively?