Question

the measure of ∠hdz can be calculated. the measure of ∠hdz is ° because ∠hdz and ∠zdm are vertical angles

Explanation:

Step1: Recall vertical - angle property

Vertical angles are congruent.

Step2: Identify the given vertical - angle measure

Given that the measure of $\angle ZDM = 88^{\circ}$, and $\angle HDZ$ and $\angle ZDM$ are vertical angles.

Answer:

$88$