All right angles generally in mathematics are; C: 90°
What is a right angle?
In geometry and trigonometry, a right angle is defined as an angle of exactly 90° or π/2 radians.
Now, If a ray is placed so that its endpoint fall on a line and the adjacent angles are equal, then we can say that they are right angles.
In conclusion, we can say that all right angles are equal to 90°
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