[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)
English Teacher
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?
[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)
You could say a shape contains three angles.
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".
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
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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