A right angle.
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An angle of 90 degrees is called a right angle.
A obtuse angle is called an obtuse angle because if obtuse means bigger in degrees and a right angle is 90 degrees than a obtuse angle must be over 90 degrees.
A right angle.
An acute angle has between 0-90 degrees (exclusive, i.e. greater than 0° and less than 90°).it is anything less than 90 degress
A square corner is a 90° angle which is called a "Right angle".