Because it is an innate/inborn behavior. Some people have the instinct to do that and some people dont. In other words; we just do it.
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Okay. You would subtract because if a problem asks you Jill walk 0.5 to school and 0.3 back to home "HOW MUCH" does she need to walk to get home which will equal to 0.2 so see
Sals dad decides to move to Euclid, Ohio because their house in Bybanks, Kentucky holds too many memories of Sal's mother, Chanahassen/Sugar
If you put an ant down on the rectangle and start him walking along the line, the 'perimeter' is the distance he has to walk in order to get back to where he started, if he stays on the line. If you put him down on a corner of this one, he has to walk (8m + 3m + 8m + 3m) = 22m. That's the perimeter.
To complete the circle you would have to walk 10 blocks south and 1 block east to return to your starting point, 11 blocks.