Question

which angles are vertical to each other? select all that apply. ∠11 and ∠9 ∠16 and ∠1 ∠5 and ∠7 ∠4 and ∠2

Explanation:

Vertical angles are pairs of opposite, equal angles formed when two lines intersect.

1. $\angle11$ and $\angle9$: These are adjacent angles on a straight line, not vertical.
2. $\angle16$ and $\angle1$: These are formed by different intersecting line pairs, not vertical.
3. $\angle5$ and $\angle7$: These are opposite angles formed by two intersecting lines, so they are vertical angles.
4. $\angle4$ and $\angle2$: These are opposite angles formed by two intersecting lines, so they are vertical angles.

Answer:

$\boldsymbol{\angle5}$ and $\boldsymbol{\angle7}$, $\boldsymbol{\angle4}$ and $\boldsymbol{\angle2}$