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  • Find the total surface area of the following cuboids (Fig 11.31):

Find the total surface area of the following cuboids (Fig 11.31):

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(i)  Total surface area = 2 (h × l + b × h + b × l) = 2(lb + bh + hl)

                                   =2(6\times4 + 4\times2+6\times2) = 2(24+8+12)

                                    = 2(24+8+12) = 88\ cm^2

(ii) Total surface area = 2 (h × l + b × h + b × l) = 2(lb + bh + hl)

                                  = 2(4\times4+4\times10+10\times4) = 2(16 + 40+40)

                                   = 2(96) = 192\ cm^2

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Devendra Khairwa

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