Question

find the missing measure.
4
$51^{\circ}$ and $x^{\circ}$ are vertical,
therefore, they
$x = $
sum to $90^{\circ}$
sum to $180^{\circ}$
are congruent

Explanation:

Step1: Recall Vertical Angles Property

Vertical angles are congruent, meaning they have equal measures.

Step2: Apply the Property to Find \( x \)

Since \( 51^\circ \) and \( x^\circ \) are vertical angles, they are congruent. So \( x = 51 \).

Answer:

First, the correct option for "Therefore, they" is "are congruent". Then, \( x = 51 \).