6. Find the area of the cardboard

Vimal crafts the model of a building using cardboard. The building is in the form of a hemisphere mounted on the cuboid. If the hemisphere is of radius 21 \(cm\) and the cuboid is of dimension \(81 cm \times 78 cm \times 83 cm\), then find the area of the cardboard required?

 

Answer:

 

The area of the cardboard required \(=\)  \(cm^2\).

 

[Note: Use \(\pi = \frac{22}{7}\).]