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    cowboys93's Avatar
    cowboys93 Posts: 9, Reputation: 1
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    #1

    Aug 6, 2009, 02:34 PM
    Using the half angle formula in trigonometry
    Well it says use the half angle formula to determine the exact values

    and one question says 112degrees 30'

    and the answer it converts it to 225 degrees
    how does that happen I don't get how it turns to 225 degrees

    or how do you do this?

    help pleaseee :)
    ArcSine's Avatar
    ArcSine Posts: 969, Reputation: 106
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    #2

    Aug 6, 2009, 02:53 PM
    is half of . Take it from there?
    cowboys93's Avatar
    cowboys93 Posts: 9, Reputation: 1
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    #3

    Aug 6, 2009, 02:55 PM
    Quote Originally Posted by ArcSine View Post
    is half of . Take it from there?
    iknow it is but like how?i don't understnd that part like how is it half of 225 degrees
    ArcSine's Avatar
    ArcSine Posts: 969, Reputation: 106
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    #4

    Aug 6, 2009, 03:03 PM
    Remember that in DMS format (degrees-minutes-seconds), one degree is made up of 60 minutes, and one minute is made up of 60 seconds--just like the relationship between the familiar units of time: hours, minutes, seconds.

    So 30' is half of one degree; hence is degrees.
    cowboys93's Avatar
    cowboys93 Posts: 9, Reputation: 1
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    #5

    Aug 6, 2009, 03:07 PM
    Quote Originally Posted by ArcSine View Post
    Remember that in DMS format (degrees-minutes-seconds), one degree is made up of 60 minutes, and one minute is made up of 60 seconds--just like the relationship between the familiar units of time: hours, minutes, seconds.

    So 30' is half of one degree; hence is degrees.
    OK so then if i had 157 degrees30' would it be 314 degrees?
    ArcSine's Avatar
    ArcSine Posts: 969, Reputation: 106
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    #6

    Aug 6, 2009, 03:11 PM
    157 degrees 30 minutes is 157.5 degrees, which is half of 315 degrees.
    cowboys93's Avatar
    cowboys93 Posts: 9, Reputation: 1
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    #7

    Aug 6, 2009, 03:23 PM
    Quote Originally Posted by ArcSine View Post
    157 degrees 30 minutes is 157.5 degrees, which is half of 315 degrees.
    Thanks. :)
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