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Math Help - Collinear Points

  1. #1
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    Collinear Points

    Show that A, O and D are collinear.

    Can someone please help me, I forget how to do these!

    Thanks.
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  2. #2
    MHF Contributor Mathstud28's Avatar
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    Quote Originally Posted by stellina_91 View Post
    Show that A, O and D are collinear.

    Can someone please help me, I forget how to do these!

    Thanks.
    if they are co-linear then the angle in between them all should be 180 and lo and behold 61+59+60=180
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