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
98 Degrees and Rising 98 Degrees and Rising 98 Degrees and Rising is the second album released by American boy band 98 Degrees. It was recorded at Blue Wave Studios in Vancouver, British Columbia, Canada and released by Motown on October 20, 1998. The album features the singles "Because of You" and "The Hardest Thing", which peaked at No. 3 and No. 5 on the "Billboard" Hot 100 respectively. The album also features two covers, Mark Wills' "I Do (Cherish You)" and "She's Out of My Life", made famous by Michael Jackson. It also features a duet with label mate Stevie Wonder, "True to