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In Figure, a circle with centre O is ins...

In Figure, a circle with centre `O` is inscribed in a quadrilatal `A B C Ds u c ht h a t ,i ttou c h e ss i d e s` BC, AB, AD na `C D` AT POINTS P, Q, R and S respectively. If `A B=29c m ,A D=23 c m ,/_B=90^0` and `D S=5c m ,` then the radius of the circle (in cm) is 11 (b) 18 (c) 6 (d) 15

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