1.

In given figure, if O is the centre of the circle, then \[x\]\[x=\_\_\_\_.\]

A. \[{{35}^{o}}\]      
B.        \[{{40}^{o}}\]
C.        \[{{70}^{o}}\]
D.        \[{{75}^{o}}\]
Answer» D.        \[{{75}^{o}}\]


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