"Othello" written by William Shakespeare play explores themes of jealousy, manipulation, betrayal

Surface Areas of cube and cuboid 

Plane figure: The figures which we can draw on a piece of paper or which lie on a plane are called Plane Figures. Example - Circle, Square, Rectangle etc.

Solid figures: The 3D shapes which occupy some space are called Solid Figures. Example - Cube, Cuboid, Sphere etc.

Surface Area: The area of all the faces of the solid shape is the total surface area of that figure. The unit of surface area is a square unit.

Lateral or Curved Surface Area

The surface area of the solid shape after leaving the top and bottom face of the figure is called the lateral surface of the shape. The unit of lateral surface area is a square unit.


Surface Area: Cube is a solid shape having 6 equal square faces.







Lateral surface area of a cube



4l2




Total surface area of a cube



6l2





Surface Area and volume of a Cuboid

Cuboid is a solid shape having 6 rectangular faces at a right angle.






Lateral surface area of a cuboid



2h(l + b)




Total surface area of a cuboid



2(lb + bh + lh)

















Example


What is the surface area of a cereal box whose length, breadth and height is 20 cm, 8 cm and 30 cm respectively?




Solution


Given,



Length = 20 cm



Breadth = 8 cm



Height = 30 cm



Total surface area of the cereal box = 2(lb + bh + lh)



= 2(20 × 8 + 8 × 30 + 20 × 30)



= 2(160 + 240 + 600)



= 2(1000) = 2000 cm2.