The responsibilities of teacher are countless why is this so?

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'

The triangles in the diagram are congruent. if mzf = 40°, mza = 80°, and mzg = 60°, what is mzb?

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air