What value of x will make AOB a straight line?

1.	What value of x will make AOB a straight line?
A.	\[30{}^\circ \]
B.	\[50{}^\circ \]
C.	\[49{}^\circ \]
D.	none of these
Answer» C. \[49{}^\circ \]

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What value of x will make AOB a straight line?

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