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Math Help - coterminal angles

  1. #1
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    Post coterminal angles

    Hi,
    I can't solve this problem. Can someone help me?

    determine two coterminal angles (one positive and one negative) for a) 8pi/4 and b) 8pi/45. give your answer in radians.

    Thank you so much!

    Isabel
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by cuteisa89 View Post
    Hi,
    I can't solve this problem. Can someone help me?

    determine two coterminal angles (one positive and one negative) for a) 8pi/4 and b) 8pi/45. give your answer in radians.

    Thank you so much!

    Isabel
    coterminal angles are obtained by adding some multiple of 360 degrees or 2pi radians to the original angle.

    a) 8pi/4
    a positive coterminal angle is: 8pi/4 + 2pi = 2pi + 2pi = 4pi
    a negative coterminal angle is: 8pi/4 - 2*2pi = 2pi - 4pi = -2pi

    b) 8pi/45
    a positive coterminal angle is: 8pi/45 + 2pi = 98pi/45
    a negative coterminal angle is: 8pi/45 - 2pi = -82pi/45

    see Find Coterminal Angles for more info
    Last edited by Jhevon; April 2nd 2007 at 05:50 PM.
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