For this case we have that by definition:
Sharp angle: It is less than 90 degrees.
Flat angle: Measures 180 degrees.
Obtuse angle: Measures more than 90 degrees
The figure shows a pair of angles, each measuring 77 degrees. Now they enter the definition of acute angles.
To find the angle CEB we subtract:
degrees
This is the same measure of angle AED.
These would be obtuse angles.
Answer:
Sharp angles (77 degrees)
Obtuse angles (103 degrees)