- 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.
- Akkadian Empire (Wikipedia)
The Akkadian Empire (/ÉËkeÉŞdiÉn/) was the first ancient empire of Mesopotamia, succeeding the long-lived civilization of Sumer. Centered on the city of Akkad (/ËĂŚkĂŚd/) and its surrounding region, the empire would unite Akkadian and Sumerian speakers under one rule and exercised significant influence across Mesopotamia, the Levant, and Anatolia, sending military expeditions as far south as Dilmun and Magan (modern Saudi Arabia, Bahrain, and Oman) in the Arabian Peninsula.
