1 .	A round balloon of unit radius subtends an angle of 90º at the eye of an observer standing at a point, say A. What is the distance of the centre of the balloon from the point A? A. $^1\over\sqrt{2}$ , B.$\sqrt{2}$ , C.2 , D.$^1\over2$
[ A ]    a [ B ]    b [ C ]    c [ D ]    d
Answer : Option B Explanation :
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