Which figures appear to be congruent polygons? 4 and 51 and 82 and 73 and 6

Me, prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using the parallelogram method and a rectangle method.

What is the correlation coefficient between the variables? round to three decimal places. enter your answer in the box

Can you me find the missing length. i attached an image.