Question

1. in the figure below, which is a vertical angle to $angle ebf$?$angle iba$$angle ibc$

Explanation:

Vertical angles are pairs of opposite angles formed by intersecting lines, sharing a common vertex and having no common sides. For $\angle EBF$, its sides are $BE$ and $BF$. The line $BE$ intersects line $IB$ at vertex $B$, and line $BF$ intersects line $AB$ at vertex $B$. The angle opposite to $\angle EBF$ is $\angle IBA$, as they share vertex $B$ and are formed by the intersecting lines $IE$ and $AF$.

Answer:

$\angle IBA$