The letter "i" in its lowercase form has one right angle, which is found at the junction where the vertical stroke meets the dot. In uppercase form, "I" has four right angles, as it consists of two horizontal lines and one vertical line.
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There are no right angles in the letter "e".
In the upper-case letter A? I see none, nor in lower case a either.
There are none.
8
4 right angles, no other angles.