- In geometry and trigonometry, a right angle is an angle of exactly 90 degrees or đ/2 radians corresponding to a quarter turn. If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles. The term is a calque of Latin angulus rectus; here rectus means “upright”, referring to the vertical perpendicular to a horizontal base line.
- Last Witness to President Abraham Lincoln Assassination I’ve Got A Secret (youtube.com)
Mr. Samuel J. Seymour, the last living eyewitness to the assassination of President Abraham Lincoln at Ford’s Theater in Washington, D.C. was the mystery guest on the February 8, 1956 episode of the I’ve Got a Secret game show. Mr. Seymour (March 28, 1860 â April 12, 1956) was actually 95 years of age at the time of this appearance instead of 96.
