Question

ce and fh are parallel lines. which angles are alternate interior angles?

Explanation:

Alternate interior angles are formed when a transversal intersects two parallel lines. They are non - adjacent angles that lie between the two parallel lines and on opposite sides of the transversal. In the given figure with parallel lines $\overleftrightarrow{CE}$ and $\overleftrightarrow{FH}$ and transversal $\overleftrightarrow{IB}$, $\angle FGD$ and $\angle CDB$ are alternate interior angles, and also $\angle DGH$ and $\angle BDE$ are alternate interior angles.

Answer:

$\angle FGD$ and $\angle CDB$, $\angle DGH$ and $\angle BDE$