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 Hale Williams (Also part Native-American) 1856-1931. -He performed the world's first heart surgery; the man lived 40 more years. Dr. Daniel Hale Williams was born on January 18, 1856 in Hollidaysburg, Pennsylvania. Daniel's father, a barber, died early. Daniel was sent to be apprentice to a shoemaker in Baltimore but ran away to join his mother.