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.
A+E Networks. In New York City on this day in 1776, Nathan Hale, a Connecticut schoolteacher and captain in the Continental Army, is executed by the British for spying. A graduate of Yale University, Hale joined a Connecticut regiment in 1775 and served in the successful siege of British-occupied Boston.