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.
Split and merge into it. Answered by The Community. Making the world better, one answer at a time. Daniel Hale Williams (born Jan. 18, 1858, Hollidaysburg, Pa., U.S. --- died Aug. 4, 1931, Idlewild, Mich.) U.S. surgeon. He graduated from Chicago Medical College.