Question

In triangle DEF, side DE is 3 inches, side EF is 4 inches, and side DF is 5 inches. The largest angle is opposite which side? Explain your choice.

Answer 1

The largest angle is opposite to the longest side. In this case, DF is the longest, so the angle facing DF, ∠E, is the largest.
The largest angle ∠E is opposite the side DF.