Increase all its linear dimensions by a multiple of 3.
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A 3 dimensionl shape is polygon.
There is no shape that is made up 3 sides that is not a triangle. Any shape that is made up of 3 sides is classified as a triangle no matter what shape or size it is.
a polyhedron (if the shape is 3 dimensional) a polygon if it is a planar shape.
It is a circular shape with 3 faces and 2 edges.
A triangle has 3 sides