Question

find the smallest angle of △xyz.

Explanation:

Step1: Recall angle - side relationship

In a triangle, the smallest angle is opposite the shortest side.

Step2: Identify the shortest side

The side lengths are 40 mm, 41 mm, and 42 mm. The shortest side is 40 mm.

Step3: Determine the opposite angle

The angle opposite the side of length 40 mm is $\angle Y$.

Answer:

$\angle Y$