Question

use the figure to complete each part.
(a) name the sides of $angle abc$.
$square$ and $square$
(b) write two other names for $angle 2$.
$square$ and $square$
(c) name the vertex of $angle 1$.
$square$

Explanation:

(a) An angle's sides are the two rays forming it. For $\angle ABC$, the vertex is $B$, so the sides are the rays starting at $B$ going to $A$ and $C$.
(b) $\angle 2$ has vertex $B$, with sides $BC$ and $BD$. It can be named by its vertex alone (when no other angles share the vertex) or with three letters (vertex in the middle).
(c) The vertex of an angle is the common endpoint of its two sides. $\angle 1$ has sides $BA$ and $BC$, meeting at $B$.

Answer:

(a) $\overrightarrow{BA}$ and $\overrightarrow{BC}$
(b) $\angle CBD$ and $\angle B$
(c) $B$