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It was the ancient Babylonians and Greeks who classified angles into degrees out of 360 degrees which is full rotation of circle.
It is an "obtuse angle."Angles that are less than 90 degrees are "acute angles."Angles that are exactly 180 degrees are "straight angles."Angles that are exactly 90 degrees are "right angles."
Angles that add to 180 degrees are called supplementary angles, while angles that add to 90 degrees are called complentary angles.
The internal angles are 144 degrees. The external angles are 36 degrees.
Angles of 3 degrees and 6 degrees are acute angles.