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Chapter8

# Chapter8 - Pre-Calculus Chapter 8A Chapter 8A Angles and...

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© : Pre - Calculus - Chapter 8A Several other important angles are: 3 4 rev 270° 3 2 rad 1 6 rev 60° 3 rad 1 8 rev 45° 4 rad 1 12 rev 30° 6 rad Example 1 : Find the angular measure of one time zone on the surface of the earth. Solution: The earth rotates once a day or by 1rev in 24 hours. Thus a 1 hour time zone has an angular measure of 1 24 rev 15° 12 rad. An angle will be bigger than a full rotation if the ray rotates from the initial side all the way around and past the initial side again. There is no limit to the size of an angle either positive or negative. Two angles with the same initial and final sides are called coterminal and their measures must differ by an integral multiple of 1rev 360° 2 rad. Below are some pictures of various angles. In each figure, the initial sides of the angles coincide.
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Chapter8 - Pre-Calculus Chapter 8A Chapter 8A Angles and...

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