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 was born and raised in the city of Hollidaysburg, Pennsylvania. His father, Daniel Hale Williams, Jr. was the son of a black barber and a Scots-Irish woman. He lived with his father who was a free negro barber, his mother, his brother and five sisters and was the fifth child of the family.