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  2. Fáry's theorem - Wikipedia

    en.wikipedia.org/wiki/Fáry's_theorem

    Integer-distance straight line embeddings are known to exist for cubic graphs. [3] Sachs (1983) raised the question of whether every graph with a linkless embedding in three-dimensional Euclidean space has a linkless embedding in which all edges are represented by straight line segments, analogously to Fáry's theorem for two-dimensional ...

  3. Plumb bob - Wikipedia

    en.wikipedia.org/wiki/Plumb_bob

    A plumb bob, plumb bob level, or plummet, is a weight, usually with a pointed tip on the bottom, suspended from a string and used as a vertical direction as a reference line, or plumb-line. It is a precursor to the spirit level and used to establish a vertical datum. It is typically made of stone, wood, or lead, but can also be made of other ...

  4. Nine dots puzzle - Wikipedia

    en.wikipedia.org/wiki/Nine_dots_puzzle

    The "nine dots" puzzle. The puzzle asks to link all nine dots using four straight lines or fewer, without lifting the pen. The nine dots puzzle is a mathematical puzzle whose task is to connect nine squarely arranged points with a pen by four (or fewer) straight lines without lifting the pen.

  5. Playfair's axiom - Wikipedia

    en.wikipedia.org/wiki/Playfair's_axiom

    Two straight lines which intersect one another cannot be both parallel to the same straight line. Playfair acknowledged Ludlam and others for simplifying the Euclidean assertion. In later developments the point of intersection of the two lines came first, and the denial of two parallels became expressed as a unique parallel through the given point.

  6. Auxiliary line - Wikipedia

    en.wikipedia.org/wiki/Auxiliary_line

    An auxiliary line (or helping line) is an extra line needed to complete a proof in plane geometry. [1] Other common auxiliary constructs in elementary plane synthetic geometry are the helping circles.

  7. Chargers look for first playoff win since 2018 season when ...

    www.aol.com/chargers-look-first-playoff-win...

    The fifth-year veteran joined Aaron Rodgers (2018) as the only players in league history with at least 500 attempts (504) and three or fewer interceptions (three) in a season.

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