Here is my web page with both Google and Excel spreadsheets.
Christmas Dodecahedron
Thanks Kaboose for clip art.
"Mortgage terms are usually 15 or 30 years.
The longer the term, the lower your monthly payment,
but the higher your overall interest costs."
This is Pascal Triangle Pro. It has lookup functions for binomial coefficient and shows Fibonacci numbers in the triangle.
- February 21, 2007 -
((1 / phi) * (1 - ((1 / phi)^70))) / (1 - (1 / phi)) = 1.61803399, more precisely, means that:
sqrt(2) - sqrt(8 * (sin(22.5 degrees)^2) * (1 - cos(135 degrees)))
= 0
It shows that the length of the shortest diagonal line of an octagon inscribed in a circle with radius of 1 is square root of 2. How cosine formula and inner product work with vectors in octagon is demonstrated in my spreadsheet.
'Vector in Pentagon' was added to my spreadsheet to calculate magnitude of vector on the diagonal line of a pentagon which is a side of pentagon times phi. (06/11/25)