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i need help on a and b please.

 May 16, 2020
 #1
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+1

a)  The internal surface  area will just be  the  area  of  the original rectangle  less the area  of  the 4 squares cut away

 

So we have

(1200)(1000)  -  4 ( 300)^2   =

 

1200000 - 4 ( 90000)  =

 

120000 - 360000 =

 

840,000 mm^2

 

b )  When the squares are cut out, the height of the box will be  300mm

The width  will  be  (1200 - 2(300) )  =  ( 600)mm

The length will be  (1000 - 2(300))  -  (400)mm

 

So  the  volume will be

 

(300 * 600 * 400)  =  72,000,000  mm^3

 

 

cool cool cool

 May 16, 2020
 #2
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+1

thank u for clearing it up for me :)

Guest May 16, 2020

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