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    #1

    Geometry

    Can I make a word like 'three-angle shape' for a triangle, 'four-angle' for rectangle, etc.
    So I could call any shape I don't know its name, like 'five-angle', 'eight-angle', etc.
    Or you may use another formula?

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    #2

    Re: Geometry

    [AmE - not a teacher]

    We can, but we usually used "sided". Four-sided, five-sided, etc.

    Also, I would say three-angled, four-angled, etc. (but this is very uncommon)

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    #3

    Re: Geometry

    You could say a shape contains three angles.

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    #4

    Re: Geometry

    Quote Originally Posted by atabitaraf View Post
    Can I make a word like 'three-angle shape' for a triangle, 'four-angle' for rectangle, etc.
    So I could call any shape I don't know its name, like 'five-angle', 'eight-angle', etc.
    Or you may use another formula?
    There are words already, like pentagon, hexagon, heptagon, octagon, etc.

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    #5

    Re: Geometry

    Note that a rectangle is not just a figure with four angles. "Rectus" means right in Latin. And a rectangle is a plane figure whose all angles are right. The names for a figure with four angles are: "quadrilateral", "tetragon" or "quadrangle".

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    #6

    Re: Geometry

    Quote Originally Posted by SoothingDave View Post
    There are words already, like pentagon, hexagon, heptagon, octagon, etc.

    Respectfully, a pentagon is a five-sided polygon, not typically a five-angled one, which I think was the original question.

  1. BobK's Avatar
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    #7

    Re: Geometry

    But given the two descriptions 'This polygon has five sides' and 'This polygon contains five angles', one's conclusions about the figure will be the same: it is a pentagon.

    b

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    #8

    Re: Geometry

    Quote Originally Posted by BobSmith View Post
    Respectfully, a pentagon is a five-sided polygon, not typically a five-angled one, which I think was the original question.
    And as angles are formed at vertices, how many shapes (excluding, of course, the circle) with different numbers of sides and numbers of angles do you know? I think Dave was trying to explain that there is a already a pattern to the names of these shapes which the OP could use, rather than trying to generate his own names via a pattern that does not sound natural to a native ear.

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    #9

    Re: Geometry

    Quote Originally Posted by Tullia View Post
    rather than trying to generate his own names via a pattern that does not sound natural to a native ear.
    Right, which is why I provided the pattern that is natural to the ear: X-sided. That's what we use. We don't use words we don't know. How else would you ask "What is a 117-sided polygon called?"

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    #10

    Re: Geometry

    Quote Originally Posted by BobK View Post
    But given the two descriptions 'This polygon has five sides' and 'This polygon contains five angles', one's conclusions about the figure will be the same: it is a pentagon.

    b
    Indeed, although one might be inclined to doubt that on seeing this pentagon.

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