Question 1067723
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The perimeter of a square is (2w+2) {{{highlight(cross(cam))}}} cm shorter than the perimeter of the triangle. 
What is the length of each side of the square in terms of w
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The condition says


4s = P - (2w+2),


where P is the perimeter of the triangle (the value of P is not given !).


Then s = {{{P/4}}} - {{{(w+1)/2}}}.


It is the answer to your question.