In triangle DEF, DE < EF < DF. Which of the following must be true?(1 point)
We can determine the relationships between the lengths of the sides of triangle DEF based on the given information:
1. DE < EF: This means that the length of side DE is shorter than the length of side EF.
2. EF < DF: This means that the length of side EF is shorter than the length of side DF.
From the information provided, we can conclude that all three side lengths have different lengths. In other words, triangle DEF is scalene, where all three sides have different lengths.
Therefore, the true statement is:
- Triangle DEF is scalene.