10. In the following figure, O is the centre of the circle, DP = 2x cm, BQ = xcm, OP = hcm and OQ = lcm. If OP and OQ are perpendicular to CD and AB, respectively, show that AB =2/3
[tex] \sqrt{3(l { }^{2} } - h {?}^{2} )[/tex]

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