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Are any three points coplanar?
In 3-dimensional space, yes, any three points are coplanar.
Are there any figures that have only three right angles?
No REGULAR polygon can have three right angles in it. Any polygon with five or more sides CAN have three right angles, as long as it's not regular.
Does a polygon have three sides?
A polygon can have any number of sides above three. The name of a three-sided polygon is a triangle.
Are there any three-dimensional figures than have fewer than 3 edges?
Yes, an example of this is a sphere which does not have any edges. If you had intended to ask if there are any polyhedra with less than three edges, the answer to that would be no, as the only figure constructable from three distinct lines is a triangle.
Can you draw a figure with three points that are noncollinear?
Of course. The vertices of a triangle, and any three vertices of any other polygon, are non-collinear. In the case of a triangle and a quadrilateral, if you had three collinear vertices, then you couldn't have the polygon.
