EXPLANATION:
Solution first(a) exercise part b:
All the internal angles of a right triangle must add up to 180, so to order the internal angles from least to greatest we must find the missing angle;
The exercise is as follows:
[tex]\begin{gathered} D=61\text{ degr}ees \\ E=48\text{ degre}es \\ F=X \\ D+E+F=180 \\ 61+48+F=180 \\ 61+48-180=F \\ 71=F \\ The\text{ thre}e\text{ angles }added\text{ }must\text{ give 180;} \\ (D+E+F)=180 \\ (61+48+71)=180 \\ \\ \end{gathered}[/tex]
Now we must order them from lowest to highest, the order is as follows:
[tex]ANSWER\colon E=48;\text{ D=61, F=71}[/tex]
