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    Re: Geogebra?
    From: Tony Oz
    Date: 2018 Dec 26, 10:45 -0800

    Dear Bill,

    Here are a bit more clean approach and its' visualisation.

    Too tricky! As it transpires - each object has its' "positive" and "negative" side, this influences the angle direction for that object, the order of intersections depends on this "siding" too...

    Slowly-slowly I get the feel of the Geogebra 3-D tool. It is VERY powerfull indeed.

    Warm regards,

    Tony

    60°N 30°E

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