Question

find the measure of the missing angle.

Explanation:

Step1: Recall angle - sum property

The sum of adjacent angles forming a straight - line is $180^{\circ}$. So, $a + 112^{\circ}=180^{\circ}$.

Step2: Solve for $a$

$a=180^{\circ}-112^{\circ}$.
$a = 68^{\circ}$

Answer:

$68^{\circ}$