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24-01-2016
Mathematics

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2. Find the surface area of the closed rectangular box shown. 6" 5"

2 Find the surface area of the closed rectangular box shown 6 5 class=

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unicorn3125 unicorn3125

24-01-2016

Close rectangular box has three couples of identical parallel faces.

there are two faces 6''×5'',
two faces 6''×3''
and two faces 5''×3''

So, the area of the box would be the total of the areas of the faces:

A = 2· 6·5 + 2· 6·3 + 2· 5·3 = 2·30 + 2·18 + 2·15 = 60 + 36 + 30 = 126 [square inches]

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