That is an important theorem in geometry: if two lines intersect to form adjacent congruent angles, then the lines are perpendicular. Those congruent angles would be right angâ¦les.
Williams later became chief surgeon of the Freedmenâs Hospital. Daniel Hale Williams III was born on January 18, 1856, in Hollidaysburg, Pennsylvania, to Sarah Price Williams and Daniel Hale Williams II. The couple had several children, with the elder Daniel H. Williams inheriting a barber business.
Daniel Bell. For other people named Daniel Bell, see Daniel Bell (disambiguation). Daniel Bell (May 10, 1919 â January 25, 2011) was an American sociologist, writer, editor, and professor at Harvard University, best known for his contributions to the study of post-industrialism. He has been described as one of the leading American intellectuals of the postwar era..