Q6 of 45 Page 11

Find the area of the cardboard required to make a closed box of length 25 cm, 0.5 m and height 15 cm.

Given: Length = 25 cm


Breadth = 0.5 m


= 0.5 × 100


= 50 cm


Height = 15 cm


To find: Area of cardboard required


Formula used:


Area of cardboard required = 2(lb + bh + hl)


Explanation:


For the values given:


Area of cardboard required = 2(lb + bh + hl)


=2(25 × 50 + 50 × 15 + 15 × 25)


= 2(1250+750+375)


= 2×2375


=4750 cm2


More from this chapter

All 45 →
4

Suppose that there are two cubes, having edges 2 cm and 4 cm, respectively. Find the volumes V1 and V2 of the cubes and compare them.

 5

The area of the base of a right circular cylinder is 616 cm2 and its height is 2.5 cm. Find the curved surface area of the cylinder.

 7

The dimensions of an oil tin are 26 cm× 26 cm× 45 cm. Find the area of the tin sheet required for making 20 such tins. If 1 square metre of the tin sheet costs Rs. 10, find the cost of tin sheet used for these 20 tins.

 8

A rectangular sheet of paper, 44 cm× 20 cm, is rolled along its length to form a cylinder. Find the total surface area of the cylinder thus generated.