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Unformatted text preview: 1.1 Angles Recall the following denitions from elementary geometry: (a) An angle is acute if it is between 0 and 90 . (b) An angle is a right angle if it equals 90 . (c) An angle is obtuse if it is between 90 and 180 . (d) An angle is a straight angle if it equals 180 . (a) acute angle (b) right angle (c) obtuse angle (d) straight angle Figure 1.1.1 Types of angles In elementary geometry, angles are always considered to be positive and not larger than 360 . For now we will only consider such angles. 2 The following denitions will be used throughout the text: 1 Ahmes claimed that he copied the papyrus from a work that may date as far back as 3000 B.C. 2 Later in the text we will discuss negative angles and angles larger than 360 . 1...
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 Fall '11
 Dr.Cheun
 Calculus, Trigonometry, Angles

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