By Pythagorean theorem we find that the length of the hypotenuse is
.
<h3>How to find the length of the hypotenuse</h3>
In the image attached we have a <em>right</em> triangle with two legs of <em>same</em> length. The hypotenuse of <em>right</em> triangles can be found by Pythagorean theorem, whose form is:

, where l is the length of the legs.
By Pythagorean theorem we find that the length of the hypotenuse is
.
To learn more on Pythagorean theorem: brainly.com/question/26183488
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ANSWER
x=12, y=10
EXPLANATION
The diagonals of a parallelogram bisect each other.
This implies that;
AE=EC


Also, DE=EB;


Put equation (2) in (1).

Expand;



Put x=2, into equation (2).

