Right angle of what a right angle is, namely two straight lines intersecting to form two equal and adjacent angles. The straight lines which form right angles are called perpendicular. Euclid uses right angles in definitions 11 and 12 to define acute angles (those smaller than a right angle) and obtuse angles (those greater than a right angle). Two angles are called complementary if their sum is a right angle. Book 1 Postulate 4 states that all right angles are equal, which allows Euclid to use a right angle as a unit to measure other angles with. Euclid's commentator Proclus gave a
Larger than Life (song) Larger than Life (song) "Larger than Life" is a song by American boy band Backstreet Boys, released on September 3, 1999 as the second single from their third studio album, "Millennium". It was written by band member Brian Littrell with Max Martin and Kristian Lundin, who also produced the song along with Rami Yacoub. The song is a "thank you" for their fans' encouragement and devotion. Music critics praised its memorable melody, singalong lyrics and the band's vocal performance. It was also on "Blender's" list of the 500 Greatest Songs Since You Were Born. Commercially, the song became a top-ten