yeltalle
yep, that's the primary reason why i put "gonna edit this". I'm not so sure about the answer since i just based it on my stock knowledge, which is unfortunately wrong. I did research after posting an answer to make sure I gave the right answer and since it was wrong, like what i told earlier, i edited it.
Answers & Comments
Right angle - 90°
Acute - less than 90°
Obtuse - between 90° and 180°
Answer: A. acute angle
Yan po (^^)
a. acute angle
Acute angles measure less than 90 degrees. Since the measure is 89, it is considered as acute angle.