Does. a 90° angle have right angles
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It means it has a measure of 90 degrees
It means bigger than a right angle.
If you mean 5 by 12 by 13 then they will form a right angle triangle
If you mean which alphabet letter, an L has one right angle; a T has a right and left acute angle.
If you mean angles then it is a right angle triangle or an isosceles right angle triangle