Question

use the figure to complete each part. (a) name the vertex of ∠dba. (b) write two other names for ∠cbd. (c) name the sides of ∠1.

Explanation:

Step1: Recall vertex definition

The vertex is the common endpoint. For ∠DBA, it's B.

Step2: Rename angle

∠CBD can also be ∠2 and ∠DBC.

Step3: Identify angle sides

Sides of ∠1 are rays BA and BC.

Answer:

(a) B
(b) ∠2, ∠DBC
(c) Ray BA, Ray BC