Trigonometry Lecture Notes, Section 1.1

degree. The symbol for the degree is: (The Babylonians decided that there are 360 degrees (360() in one full rotation. A . right angle. is one-fourth of a full rotation and measures 90(. A . straight angle. is one-half of a full rotation and measures 180(. An angle between 0( and 90( is called an . acute angle. An angle between 90( and 180( is ... ................
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