So you question is most likely about a triangle DEF with the 3 angles being named D, E, F. The triangle would look something like the image attached below.
If that is what is being asked then i need more info to answer but
By Definition it would be 180 degrees.
The amount of hours you worked would be 7.5, you divide 600 by 80.
Answer:
I think the answer is 672 please be right
That’s cool. i need p01nts so imma comment