The bottom right corner of the angle is the origin, putting the majority of the arc in quadrant II.
0 degrees starts on the positive x-axis to right.
Counterclockwise is a positive angle.
All degrees are relative to the edges of the picture.
The side nearest to the positive y-axis is at ~92.38°
The side nearest to the negative x-axis is at ~180.32°
The angle or the arc is ~87.94°
An actual 89° arc, I do appreciate. An 88° arc labelled as an 89°, I do not. I ardently hope you gain more skill in measuring angles, and have less malice that causes you to wish your misery on others.
I mean there's no reason that a perfectionist would be irritated by an 89 degree angle, so I suspect this meme has had its way with you just as intended
You might have made a tiny mistake. Screens rarely if ever depict images as undistorted. Might want to double check using the files pixels to account for your screen distorting or stretching the visual aspect of the image. Such a tiny offset in angle could very well be from distortions.
It's also drawn on paper and it might not be perfectly photographed from a top view angle. For that you should try and digitally extrapolate the circle to see if it makes a perfect one where the radius is the same on both axis.
Sincerely, a digital artist trying to chime into your geometry project!