Oh, dude, that's an acute angle! It's like when you're trying to fit into skinny jeans but they're just too tight - that's how acute angles are, they're less than 90 degrees but still trying to squeeze in there. So yeah, less than 45 degrees? Acute angle all the way.
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An angle less than 90 degrees is called an acute angle.
An angle that is less than 900 is called an acute angle.
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
An angle of 147 degrees is an obtuse angle because it is greater than 90 but less than 180 degrees
An angle of 140 degrees is an obtuse angle because it is greater than 90 but less than 180 degrees.