Which shape is called a rectangle?

A four-sided shape with opposite sides equal

A rectangle is a quadrilateral, which means it has four sides. Its opposite sides have equal lengths, and each corner is a right angle. The longer pair and the shorter pair may be different, so a rectangle need not look like a square. A square is a special rectangle because all four of its sides are equal, but the defining idea here is the relation between opposite sides.

Choice A is correct because it describes a four-sided figure whose opposite sides are equal. The three-sided option describes a triangle, and a completely round figure has no straight sides or corners. A group of dots is not automatically a closed four-sided figure. In a drawing, checking the number of sides and comparing opposite sides helps identify a rectangle; checking right angles gives an additional geometric confirmation.

This is a Class 9 Art Education question. Chapter: Elements of Art. Topic: Shape.