Example 1 Mary wants to decorate her Christmastree. She wants to place the tree on a wooden boxcovered with coloured paper with picture of SantaClaus on it (see Fig. 13.4). She must know the exactquantity of paper to buy for this purpose. If the boxhas length, breadth and height as 80 cm, 40 cm and20 cm respectively how many square sheets of paperof side 40 cm would she require?Solution : Since Mary wants to paste the paper onthe outer surface of the box; the quantity of paperrequired would be equal to the surface area of thebox which is of the shape of a cuboid. The dimensionsFig. 13.4of the box are:

Example 1 Mary wants to decorate her Christmastree. She wants to place

1.	Example 1 Mary wants to decorate her Christmastree. She wants to place the tree on a wooden boxcovered with coloured paper with picture of SantaClaus on it (see Fig. 13.4). She must know the exactquantity of paper to buy for this purpose. If the boxhas length, breadth and height as 80 cm, 40 cm and20 cm respectively how many square sheets of paperof side 40 cm would she require?Solution : Since Mary wants to paste the paper onthe outer surface of the box; the quantity of paperrequired would be equal to the surface area of thebox which is of the shape of a cuboid. The dimensionsFig. 13.4of the box are:
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