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Add together all 4 sides if you mean a parallelogram
It means that you need more math skills hahahahahahahahaha hahahahahahahahaha hahahahahahahahaha hahahahahahahahaha
By finding a pattern the first time you solve a problem, then applying this pattern (algorithm) to solve similar problems.
The mean means the average. To get the average, you have to add all of the numbers up and divide the sum by how many numbers are in the group that you are finding the mean of.
This is a simple description of finding the perimeter of a square or rectangle. It has 2 values to be added for length, and 2 to be added for width, the total sum equals the perimeter. If you add length and width and then multiply by 2 you can most likely arrive at the proper answer faster than adding the 4 values.