Vocabulary Check: Write a vocabulary term to complete each sentence: acute angle, degree, obtuse angle, right angle. 9. The unit used to measure an angle is a degree. 10. An obtuse angle measures more than 90 degrees and less than 180 degrees. 11. Square corner is another name for a right angle. 12. An angle that measures 208 degrees is an obtuse angle. 13. Test Practice: Which is the acute angle?