In the English alphabet, the uppercase letters that have perpendicular line segments are A, B, D, E, F, H, K, L, T, and Z. This totals to 10 uppercase letters. Each of these letters includes at least one pair of line segments that meet at a right angle.
Remember that "perpendicular" means "at a right (90 degree) angle". The two uppercase letter that are formed with onlytwo perpendicular segments are T and L.
25 o because sOme of them are perpendicular
Eleven of them - AHIMOTUVWXY
Seven
They are H, I, N, O, S, X and Z.
T L
The answer to this probably depends on (a) the font and (b) wheter the uppercase letter or the lowercase letters are considered. In this particular font, in uppercase B D E F H I K L M N P R and T all have perpendicular segments, G has a short perpendicular segment J has a perpendicular segment which ends in a curve U has two perpendicular segments joined by a curve and in lowercase b d h i k l m n p r and u all have perpendicular segments a f g j and t all have perpendicular segments with curved parts.
Remember that "perpendicular" means "at a right (90 degree) angle". The two uppercase letter that are formed with onlytwo perpendicular segments are T and L.
6 uppercase letters: E F G H L T1 lowercase letter: t
The letter - H
25 o because sOme of them are perpendicular
None. They are all just letters.
7 have rot
Eleven of them - AHIMOTUVWXY
In the upper case Roman alphabet they are: C, I, J, O and S. However, in the case of C, O and S, there are parts of the curved segments which are parallel.
Perpendicular means the lines form a 90 degree angle or right angle where they meet so letters that have perpendicular lines could be: Uppercase "T" Uppercase "L" Uppercase "F" Uppercase "E" Uppercase "X" and lowercase "x" are close but I don't think they make a right angle. You could argue that "B", "D" and lowercase "t" also have perpendicular lines but they are not straight lines so I don't know if those count.
Seven