Question

what is m∠1? m∠1 = o

Explanation:

Step1: Recall exterior - angle property

The exterior - angle of a triangle is equal to the sum of the two non - adjacent interior angles.
Let the exterior angle be $111^{\circ}$, and the two non - adjacent interior angles be $\angle1$ and $73^{\circ}$. So, $111^{\circ}=\angle1 + 73^{\circ}$.

Step2: Solve for $\angle1$

We can rewrite the equation as $\angle1=111^{\circ}-73^{\circ}$.
$\angle1 = 38^{\circ}$

Answer:

$38$