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None. A hexagon has eight angles all of which are 45 degrees. A right angle has 90 degrees.
A "right angle" is 90 degrees.
In a three-quarter turn, there are three right angles. A right angle measures 90 degrees, so in a full turn (360 degrees), there are four right angles. Therefore, in a three-quarter turn (270 degrees), there are three right angles, as each right angle is 90 degrees.
There are four right-angles (90 degrees), one in each corner of the square.
A regular hexagon has six equal internal angles of 120 degrees. None of them are right-angles !