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There are 3 right angles in the letter F
In the upper-case letter A? I see none, nor in lower case a either.
Right angles of 90 degrees
A right angle of 90 degrees can be seen in the letter F
There are no angles in the letter l it is a straight line That's not right. There is one angle in the Letter l. its a 180 degree angle.
I don't see any at all.
In the letter N, you can see two acute angles formed by the diagonal lines that intersect at the top point and the bottom right point of the letter.
You could see them in squares.
A right angle is 90 degrees. You will know if you see a right angle because it will usually have a square in its corner.
i see only 6 4 on the capital H and 2 on the two t's
A regular pentagon doesn't have any right angles ! See related link.
Three right angles, where one of the "arms" of the angle curves inwards which makes the angle appear less than a right angle.