Question

find $m\angle1$. then classify the triangle by its angles.
$m\angle1=\square^\circ$.
the triangle can be classified by its angles as $\square$

Explanation:

Step1: Sum of triangle angles is 180°

The sum of interior angles in a triangle is $180^\circ$.

Step2: Calculate $m\angle1$

$m\angle1 = 180^\circ - 40^\circ - 30^\circ$
$m\angle1 = 110^\circ$

Step3: Classify the triangle

Since one angle is greater than $90^\circ$, the triangle is obtuse.

Answer:

$m\angle1 = 110^\circ$
The triangle can be classified by its angles as an obtuse triangle.