I had to overcome measuring one very large distance going to one end of the school and then measuring just as vast a distance going to the other end of the school just for two classes. Potential sources of error include tape measure not being totally straight when laid out on the ground and the door has varying widths. The most important thing to consider in this lab is units. Make sure you are using the same units always.
Monitoring your unit use is always important. Its interesting to find that the school now feels larger than you initially thought, perhaps this will help you when it comes to looking at answers and deciding if your answer is reasonable.
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