• # question_answer The measurements of $\Delta DEF$ are $EF=8.4\text{ }cm,$ $\angle E=100{}^\circ$ and$\angle F=82{}^\circ$. Which of the following is correct? A)  ADEF can be constructed.          B)  ADEF is an obtuse angled triangle.C)  A cannot be constructed           D)  ADEF is an acute angled triangle.

$\Delta le$cannot be constructed as sum of only two $\Delta les$ $\angle E$ & $\angle F>180{}^\circ (\angle E+\angle F=182{}^\circ ),$which is not possible in a Ale.