In the given figure, AOB is a straight line. Find angle marked b if c

1.	In the given figure, AOB is a straight line. Find angle marked b if c = 2a and b = 3a.
A.	\[60{}^\circ \]
B.	\[30{}^\circ \]
C.	\[110{}^\circ \]
D.	\[90{}^\circ \]
Answer» E.

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In the given figure, AOB is a straight line. Find angle marked b if c = 2a and b = 3a.

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