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.
Leon Hale speaks during his 90th birthday luncheon at Brennan's, Tuesday, May 31, 2011. Photo: Jerry Baker, For The Chronicle. Hundreds of friends, family and fans celebrated at party held for the newsman/columnist on May 28 at the Round Top Rifle Association Hall.