Relation between surface area and arris length for rectangle
consisting of one plastic cuboid (size 140mm×100mm×60mm) and 6 plastic pieces demonstrating the surface area of the same size cuboid. Smooth and no burrs on the surface.

Maths Teaching Kit School Lab Equipment Suppliers in India 

Ltekonline are the manufacturers of Area and Perimeter Demonstrator Maths Teaching Kit used to demonstrate engineering principles in Engineering Colleges, Engineering Schools and Maths Teaching Kits for Engineering Teaching Lab in Universities