Is the following definition of obtuse angles reversible? if yes, write it as a true biconditional. obtuse angles are angles that measure greater than 90 degrees. a. the statement is not reversible b. yes, if angles are obtuse, then they measure greater than 90 degrees c. yes, angles are obtuse if and only if they measure greater than 90 degrees d. yes, angles are obtuse if they measure greater than 90 degrees.