An acute angle is less than 90°. It might look small and sharp, like the corner in a slice of pizza. An obtuse angle is between 90° and 180°. It’s wider than a right angle but not a straight ...

That means the angle is 90 degrees. Nice big piece for square. So what next? You’re cutting that one at an obtuse angle. That means the angle is between 90 and 180 degrees. Not bad eh?