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.
1 Daniel Boone (singer) (born 1942), British pop musician. 2  Dan Boone (baseball) (1895â1968), Major League Baseball pitcher.  Danny Boone (born 1954), Major League Baseball pitcher.