Well I am not sure what is required but to me Euclidian geometry is anything that is constructed so perhaps this will do.
If you constructed a square ABCD where the side length is 2x.
Then bisect side AB to give the point E
then join DE, DE will be x*sqrt5 in length.
Here are some other ideas. The spiral one is quite nice.
Well I am not sure what is required but to me Euclidian geometry is anything that is constructed so perhaps this will do.
If you constructed a square ABCD where the side length is 2x.
Then bisect side AB to give the point E
then join DE, DE will be x*sqrt5 in length.
Here are some other ideas. The spiral one is quite nice.