Q: What is the angle that measure exactly 90 degrees?

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It is called a "right angle".

The corner of a square measures 90 degrees which is 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.

An angle less than 90 degrees is an "acute angle". An angle of exactly 90 degrees is a "right angle". An angle more than 90 and less than 180 degrees is an "obtuse angle". An angle of exactly 180 degrees is a "straight angle". An angle of more than 180 degrees is a "reflex angle".

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.

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An angle which measure exactly 90 degrees is called a right angle.

Yes a right angle is exactly 90 degrees

It is called a "right angle".

The corner of a square measures 90 degrees which is 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.

commonly called a right angle

No, an acute angle must measure between 0 and 90 degrees exclusive. So if it were 89.999999999 degrees, it is still an acute angle, but once the degree hits 90, it can only be a right angle.

An angle less than 90 degrees is an "acute angle". An angle of exactly 90 degrees is a "right angle". An angle more than 90 and less than 180 degrees is an "obtuse angle". An angle of exactly 180 degrees is a "straight angle". An angle of more than 180 degrees is a "reflex angle".

An angle is considered right if it's measure is exactly 90 degrees.

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.

A right angle is an angle of 90 degrees.

An angle that is exactly 90 degrees is called a right angle.