A quadrilateral.
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Balls
a circle
Side by side, they would form a rectangle. From part-side touching part-side through to corner to corner, they would form a shape somewhat like a figure of eight. There are other possibilities - eg corner of one touching the side of the other.
A side in a polygon is an edge; it is the line segment joining two adjacent vertices, or corners. A corner is the point where two adjacent sides meet.
A square with a rounded corner. =)