Question

find the area of the cardboard required to make an open box of length 28 CM breadth 0.5 metre and height 0.2​

Answer 1

Given l = 28cm,

         b = 0.5m

            = 50 cm and

         h = 0.2m

            = 20 cm

Total surface area = 2 *( lb + lh + bh)

                              = 2* (28 * 50 + 28 *20 + 50*20) cm2  

Total surface area = 2* (1400+ 560+ 1000)

                               = 5920cm2

But the open box will have no top surface

Area of top surface = l*b

                                 = 28 * 50 = 1400cm2

Reqd Area                = 5920-1400

                                 = 4520cm² ( Answer )

∴ To make an open box of length 28 CM breadth 0.5 metre and height 0.2​

 area of cardboard required is 4520 cm².

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Answer 2

Step-by-step explanation:

this is your answer

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