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I have a trouble understanding our lesson this week. Please help me out.I want a clear explanation how to solve it. The problem goes like this:

A square is a quadrilateral with four equal sides. The are of a square is equal to the square of its side. The diagonal of a square is a line segment joining any two non-consecutive sides. Find the area of a square and the length of its diagonal whose vertices are: (3,1), (-1,5), (-5,1) (-1,-3).

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by sarahpelos

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