Polygon

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Polygon[{$point_1$, $point_2$ ...}]

represents the filled polygon primitive.

Polygon[{{$p_11$, $p_12$, ...}, {$p_21$, $p_22$, ...}, ...}]

represents a number of filled polygon primitives.

A Right Triangle:

Notice that there is a line connecting from the last point to the first one.

A point is an element of the polygon if a ray from the point in any direction in the plane crosses the boundary line segments an odd number of times.

PointSize
Rectangle