Question

¿que angulo es complementario del ángulo bac?

Explanation:

Step1: Define complementary angles

Complementary angles sum to $90^\circ$.

Step2: Analyze right triangles

In $\triangle AEC$: $\angle BAC + \angle ACE = 90^\circ$.
In $\triangle ADB$: $\angle BAC + \angle ABD = 90^\circ$.

Step3: Identify matching angles

Angles that add with $\angle BAC$ to $90^\circ$ are its complements.

Answer:

The complementary angles of $\angle BAC$ are $\angle ACE$ (angle at point C between segment AC and EC) and $\angle ABD$ (angle at point B between segment AB and DB).