. Is the following statement a good definition? Why? An obtuse angle is an angle whose measure is greater than 90°. No, it is not. The statement contains false information. No, it is not. A straight angle has a measure greater than 90°, but it is not an obtuse angle. Yes, it is. The definition is reversible. Yes, it is. All obtuse angles have measures greater than 90°.

Answer 1

Yes, it is. All obtuse angles have measures greater than 90°, and the reverse is also true: any angle with a measure greater than 90° is an obtuse angle.