Ax = bc - c solve for x
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if the limit of -x² goes to "something", and the limit of x² goes to the same "something", if their limit coincide, and yet they're bounding the cosine expression, therefore, since the cosine expression is "sandwiched" between -x² and x², then the cosine expression "squeezes in" that little sliver between both -x² and x², and will inevitably go to the same limit.
You are given the length of every side, except for two, that can be easily derived from the others:
- The long horizontal side on top is the sum of the three beneath it, so it is
- The vertical one on the right is, similarly, the sum of the opposite side to the far left, and the two small sides near it:
The sum of all sides, including these two, will give you the perimeter of the polygon.