In this photo some of the numbers represent distances. I have drawn the line from the discernible outer corners of the feature and so are only approximate. The two 90's show right angles. The 63 and 83 on the right angled triangle to the right is approximately 3:4, which makes it roughly a Pythagorean triangle of 3:4:5.
Note that the distance 83 occurs twice and 61 occurs 3 times (61,61,63) within the limits of measuring like this. 135 refers to two angles as pointed out, note 180-135=45.
We then have a significant angles 30,45,60, and 90 degrees. Also the angles of a Pythagorean triangle.