v21’s avatarv21’s Twitter Archive—№ 32,485

    1. …in reply to @joonturbo
      @joonturbo @AlexKalopsia or, actually, the answer is at the linked mathpuzzle.com/tilepent.html . D + E = 180
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  1. …in reply to @v21
    @joonturbo @AlexKalopsia meaning two adjacent angles add up to 180, meaning two sides with a single side between them are parallel.
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