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Acute angle: lower than 90 degrees but higher than 0 degree Right angle: exactly 90 degrees Obtuse angle: greater than 90 degrees but lower than 180 degrees Straight angle: exactly 180 degrees Reflex angle: greater than 180 degrees but lower than 360 degrees 1 Revolution: exactly 360 degrees

Acute angle:
An angle whose measure is less than 90 degrees. The
following is an acute angle.
Right angle:
An angle whose measure is 90 degrees. The following is a
right angle.Right angle
Obtuse angle:
An angle whose measure is bigger than 90 degrees but less
than 180 degrees. Thus, it is between 90 degrees and 180 degrees. The following
is an obtuse angle.
Straight angle
An angle whose measure is 180 degrees.Thus, a straight angle
look like a straight line. The following is a straight angle.
Reflex angle:
An angle whose measure is bigger than 180 degrees but less
than 360 degrees.The following is a reflex angle.