Question

what is ( mangle 1 )?
( mangle 1 = square^circ )

Explanation:

Step1: Find the interior angle adjacent to ∠1

First, calculate the third interior angle of the triangle using the sum of angles in a triangle ($180^\circ$).
$180^\circ - 47^\circ - 44^\circ = 89^\circ$

Step2: Calculate m∠1 as a supplementary angle

∠1 and the 89° angle form a linear pair (supplementary, sum to $180^\circ$).
$m\angle1 = 180^\circ - 89^\circ$

Answer:

$91^\circ$