Planes are not necessarily drawn as parallelograms. The Cartesian plane is drawn as a rectangle and, contrary to what the previous answerer [ignorantly] claimed, it does have a ninety degree angle where the axes meet.
The representation of a plane in 3-d space is often depicted as a parallelogram in much the same way that the drawing of a cube has parallelograms for its lateral faces. A parallelogram is a compromise between lines of perspective (which should meet at the centre of perspective) and the wish to maintain the parallel nature of these edges.
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A rectangle (opposite sides are parallel which is a parallelogram!)
No, because a parallelogram is a kind of quadrilateral - a FOUR sided plane figure.
a 2d shape A two dimensional figure can also be called a plane figure since it can be drawn in the two dimensional plane. Some examples include the triangle, the square, the circle, the pentagon, the hexagon, the parallelogram, the rhombus, etc.
Correct
A square.