1.

O is the centre of a circle with points A and B on its circumference. Which of the following is true of 0, A and B?

A.  \[\text{OA+OB=AB}\]       
B.  \[\text{OA=OB}\]          
C.        \[\text{OA=2OB}\]         
D.      \[\text{AB=}\frac{\text{1}}{\text{2}}\text{OA}\]
Answer» C.        \[\text{OA=2OB}\]         


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