A half turn is 180° and is known as a straight angle (or angle on a straight line). A three-quarter turn is 270°. An acute angle is less than 90°. An obtuse angle is between 90° and 180°.

Dear Rabbi. Our Rabbis tell us we must drink on Purim until we no longer know the difference between Haman and Mordechai. This to me sounds like an awful lot of booze. How can we justify this ...