JEE Mathematics Online Test Ellipse Set B

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Question 1

Question

Consider an ellipse x2/a2 + y2/b2= 1, centred at point O and having AB and CD as its major and minor axes respectively. If S1 be one of the foci of the ellipse, radius of incircle of triangle OCS1, be 1 unit and OS1 = 6 units, then

Answer
10 units
15 units
25 units
20 units