An angle greater than 0 but less than 90 degrees is an acute angle
An angle of 90 degrees is a right angle
An angle greater than 90 but less than 180 degrees is an obtuse angle
An angle greater than 180 degrees is a reflex angle
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12 degrees is an acute angle because it is greater than 0 but less than 90 degrees.
The total interior angle of a 12 sided polygon is = (12 - 2) 180 degrees = 1800 degrees. The internal angle at each vertex of an regular dodecagon is equal to = = 150 degrees. While the exterior angle at a single vertex is = = 30 degrees. The total exterior angle of a 12 sided polygon is 360 degrees.
12 degrees
90-78= 12 degrees
A 12 sided figure is called a dodecagon. This type of polygon has 12 angles and each angle equals 150 degrees.