SOLUTION ACCEPTED

Hello!

What exactly do you need help with? With the trapeze arm?

Regards

I wait your answer

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I answer you updating this answer so I can attach some images.

So,

We have the side / slat 1 of 73 cm in length

side / slat 2 33 cm long

and the distance between these two parallel segments is 99 cm

To achieve a correct alignment or centering of the segment of 33 with respect to that of 73 without compass and using ruler you can do the following:

1) calculate the difference between 73 and 33, and divide it into two parts.

(73 - 33 = 40 40: 2 = 20)

With this difference we complement the right and left side of the 33, it is as if we were building a square.

Now it only remains to join the necessary points, and verify that all angles and distances are correct

And you have an isosceles parallelogram with the shortest side centered on the longest.

Hope this can help you.

Regards.

I can't find the ways to put it together, I have the slats and I can't find the way so that the major and minor bases are perfectly centered. The logic would be with a compass, but it would have to be a little big compass.