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
360 Degrees of Power 360 Degrees of Power 360 Degrees of Power is the only album by female emcee, author, and activist Sister Souljah, which was released in 1992 on Epic/SME Records. The album was met with criticism, not only for its performances—most of which were angry spoken-word tirades that Souljah screamed rather than traditional hip-hop rhymes—but also because of its controversial lyrics. The two singles and music videos, "The Hate that Hate Produced" and "The Final Solution: Slavery's Back in Effect," were banned by MTV because of their inflammatory language and imagery. The album reached #72 on the Top R&B/Hip Hop album chart,