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Can someone tell me what I do in number 3 in a piece of paper then send it to me

Can someone tell me what I do in number 3 in a piece of paper then send it to me-example-1
User Upabove
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1 Answer

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just add all the sides - as it's a rectangle the opposite sides are the same.  Also i think you mixed up the length with the width of the rectangle.  
User Gianfra
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