A angle that is smaller than 90 degrees is an acute angle.
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An angle that measures greater than 90 degrees but less than 180 degrees is an obtuse angle.
An angle of 105 degrees is classified as an obtuse angle, as it measures greater than 90 degrees but less than 180 degrees. In geometric terms, an obtuse angle is one that is between 90 and 180 degrees. This means that the angle is larger than a right angle (90 degrees) but smaller than a straight angle (180 degrees).
Well, honey, if you're talking about an angle that measures 170 degrees, you're looking at an obtuse angle. It's bigger than a right angle but smaller than a straight angle. So, grab your protractor and get measuring!
An obtuse angle.
An angle smaller than a right angle - is an acute angle. Larger than a right angle, but smaller than 180 degrees is an obtuse angle. Angles between 180 and 360 degrees are reflex angles.