Answer:
The answer is option B.
Step-by-step explanation:
To find EF we use the sine rule
DE / sin F = EF / sin D
since EF corresponds to D
D = 75°
F = 50°
DE = 3
So EF is
3 / sin 50° = EF / sin 75°
Make EF the subject
EF = 3sin 75° / sin 50°
EF = 3.78
The final answer is
EF = 3.8
Hope this helps you
