Question

1. name the angle in four ways.

Explanation:

Step1: Use vertex - only name

The vertex of the angle is B, so one name is $\angle B$.

Step2: Use three - point name

With the vertex in the middle, we can name it $\angle ABC$ or $\angle CBA$.

Step3: Use number name

The angle is labeled as 1, so we can name it $\angle 1$.

Answer:

$\angle B$, $\angle ABC$, $\angle CBA$, $\angle 1$