Obtuse, if that’s what you mean.
Answer:
∠ECF = 37°
Step-by-step explanation:
∠ACG = 37° because it is a complementary angle to 53° (37° + 53° = 90°)
∠ECF = 37° because it is a vertical angle to 37°
Using remainder theorem, we get:

Substitute t = 5 into the equation:


Thus, we get a remainder of 93 or (A)