because a right angle is right and a left angle is wrong
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Can a right angle be on the left? Yes a right angle can be on the left
a left angle is the opposite from a right angle :)
Because the phrase 'right angle' indicates 90 degrees whereas there is no such angle as a 'left angle'
Left to right or right to left.
If you mean which alphabet letter, an L has one right angle; a T has a right and left acute angle.