The corner of a square measures 90 degrees which is a right angle.
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A right angle is exactly 90 degrees
It is called a "right angle".
An acute angle is lower than 90 degrees. An obtuse angle is higher than 90 degrees. But lower than 180 degrees. A right angle is exactly 90 degrees. A straight angle is exactly 180 degrees. A reflex angle is higher than 180 degrees. A Circle is exactly 360 degrees.
That would never happen.
An acute angle is one that is between 0 and 90 degrees. A right angle is exactly 90 degrees. An obtuse angle is one that is between 90 and 180 degrees. Acute.