Question

which angle number represents an angle adjacent to ∠cgb?

Explanation:

Step1: Recall the definition of adjacent angles

Adjacent angles share a common vertex and a common side.

Step2: Analyze $\angle CGB$

For $\angle CGB$, vertex is $G$. Looking at the figure, $\angle 2$ shares vertex $G$ and side $GB$ with $\angle CGB$.

Answer:

$\angle 2$