1.

In the shown figure, AB is a diameter of the circle with centre O. If AC is a chord and OM is perpendicular on it where \[\mathbf{AB}\text{ }=\text{ }\mathbf{13}\text{ }\mathbf{cm}\] and \[\mathbf{BC}\text{ }=\text{ }\mathbf{5}\text{ }\mathbf{cm}\], then the length of OM is  ________

A. 6.25 cm
B.         3.25 cm
C.    3.5 cm   
D.                                                       2.5 cm
E.  None of these
Answer» E.  None of these


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