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 of an angle is the common endpoint. For ∠DBA, the common endpoint is B.

Step2: Recall angle - naming

∠CBD can also be named as ∠2 and ∠DBC.

Step3: Recall angle - side definition

For ∠1, the sides are rays BA and BC.

Answer:

(a) B
(b) ∠2, ∠DBC
(c) Ray BA, Ray BC