A rectangle is a quadrilateral with opposite sides equal in length and all interior angles measuring 90 degrees. The diagonals of a rectangle are equal in length and bisect each other. The area of a rectangle is calculated by multiplying its length and width while the perimeter is the sum of all sides.

In Class 6 Maths Chapter 8 on Playing with Constructions students learn how to use a ruler and compass to perform geometric constructions. The chapter covers creating basic shapes like triangles and quadrilaterals along with constructing angles perpendicular bisectors and parallel lines. It emphasizes the importance of accurate measurements and step-by-step construction techniques.