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I draw a $7 \times 11$ rectangle, and then another rectangle outside the first rectangle, so that the corresponding sides of the rectangles are parallel, and the distances between the corresponding sides is 1. Find the area of the border between the two rectangles.

eileenthecoolbean  Aug 7, 2017
 #1
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The new rectangle will have the dimensions  of (7 + 2) x (11 + 2)  =  9 x 13

 

So....the area between them is just  

 

( 9 * 13) - (11 * 7 )  =

 

117 - 77 =

 

40 units^2

 

 

cool cool cool

CPhill  Aug 7, 2017
edited by CPhill  Aug 7, 2017
edited by CPhill  Aug 7, 2017

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