GeometryACC - The SSS"Find the angle measures"Problem

Below you will find the lengths of the sides for 3 different triangles. Your task will be to do the necessary work ending with the measures of the smallest angle in each of the triangles.

#1. Side lengths 7 cm, 10 cm, and 12 cm.

#2. Side lengths 9 cm, 12 cm, and 15 cm.

#3. Side lengths 6 in., 9 in., and 11 in.