Geometry-Please Help

A man has a garden 10 meters square to fence. How many fence posts are needed if each post is 1 meter from the adjacent posts?

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    Ms. Sue
  2. If the garden is square and has sides of n metres, then each side will require 2+(n-1) posts with the 2 posts at the corners. As the corner posts are common with adjacent sides then the total number of posts is

    4 sides of n-1 plus 4 corner posts.

    4(n-1) + 4.

    if n=10 then the number of posts is


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