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
Backstreet Boys: Larger Than Life McLean confirmed the deal, telling "Us Weekly" that the residency would begin in January 2017. On September 23, the Backstreet Boys confirmed their Vegas residency happening in 2017 titled Backstreet Boys: Larger Than Life. According to KVVU-TV's report, "Backstreet Boys: Larger Than Life" is the fastest-selling residency in Las Vegas in history. It is also the first time that Planet Hollywood has opened up balcony seats for headliner, making the theater 2000 seats bigger than fellow headliner Jennifer Lopez and Britney Spears. Its first round with 9 shows had grossed total revenue of $5,399,176 with 4,667 average audiences per show,