Q1 of 67 Page 187

A cuboid is 12 cm long, 9 cm wide and 5 cm high. Calculate the total surface area of the cuboid.

Length = l = 12 cm


Breadth = b = 9 cm


Height = h = 5 cm


Total surface area of cuboid = 2 × (lb + bh + lh)


= 2 × (12×9 + 9×5 + 12×5)


= 2 × (108 + 45 + 60)


= 2 × 213


= 426 cm2


Therefore, total surface area of the cuboid is 426 cm2


More from this chapter

All 67 →
2

Three cubes with edges 8 cm, 6 cm and 1 cm respectively are melted together and formed into a single cube. Find the total surface area of the new cube.

 3

The dimensions of a box are 50 cm × 36 cm × 25 cm. How many square cm of cloth is needed to make a cover for the box?

 4

The area of each face of a cube is 100 cm2. If the cube is cut into two equal parts by a plane parallel to the base then find the total surface area of each equal part.

 5

An open box is made of wood 3 cm thick. Its external length, breadth and height are 146 cm, 116 cm and 83 cm respectively. Find the cost of painting the inner surface at Rs 2 per 1000 sq. cm.