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.
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Yes, congruent angles are angles that have the same measure.
Angles with the same angle measure are congruent.
complementary angles
congruent angles
Not normally. A protractor is generally used to measure angles.