A triangle.........whose side is i.......and the other side is 2............4 - 1 = 3......square root of 3.......same dimensions as the ellipse......................using the square root of 3 as the length of one side of a triangle...............and two the other...................u get the square root of 7..............the square root of 3 squared is 3..........2 squared is 4........4 + 3 = 7

In geometry, a golden rectangle is a rectangle whose side lengths are in the golden ratio, 1 : 1 + 5 2 {\displaystyle 1:{\tfrac {1+{\sqrt {5}}}{2}}} , which is 1 : φ {\displaystyle 1:\varphi } (the Greek letter phi), where is approximately 1.618.

Golden rectangle - Wikipedia

https://en.wikipedia.org/wiki/Golden_rectangle