(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I want to measure the size of my back yard. I estimate that I can measure the length and width of the yard using a tape measure to an accuracy of 0.05m. I find that the length of the yard is 8.6 m and the width is 7 m.

Calculate the perimeter of the yard and its error

Now calculate the area of the yard and its error

2. Relevant equations

s=square root(changeA)^2+(changeB)^2)

3. The attempt at a solution

I calculated the perimeter and got 31.4m. i cant figure out how to get the error in the perimeter. I thought it would be 8.55(2)+6.95(2) =31.0 -31.4=.4 but its not correct

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# Propagation error in finding the perimeter and area, please help.

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