right angles and straight angles
There are no right angles in the letter "e".
right (90˚) and 180˚ angles
In the upper-case letter A? I see none, nor in lower case a either.
Right angles of 90 degrees
There are 3 acute angles and 2 obtuse angles in the letter A.
The letter "K"
As a capital letter M it has three angles
The letter 'W' has three acute angles.
The letter 'H' has 8 angles. Each of the two vertical lines has two right angles, and the horizontal line has four angles (two acute angles and two obtuse angles). So, altogether, the letter 'H' has 8 angles.
The letter "N" as two acute angles.
4 angles
right angles and straight angles
There are 3 right angles in the letter F
F for corresponding angles and Z for alternate angles
The letter "w" has three acute angles.
Z has two acute angles and two obtuse angles.