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   Excel can be used just not for calendars or planners.  It also comes into play   
when used as math tools.  It would prove more useful when combined with
google calculator, showing how the trigonometric function is used to make
calculation with various degrees on triangles.

Here is Excel Trigonometry:
  
- May 26, 2024 -

  
- September 2, 2006 -


   An estimated "58.28252559 degrees" - Google Search shows
that the golden ratio plays a role in the golden rectangle.

- October 9, 2006 -

YouTube - Sequences 5: Golden Rectangles


   The golden ratio is now used to draw the golden triangle
and the pentagram on the same spreadsheet.

phi - (((1 / phi) * (1 - ((1 / phi)^70))) / (1 - (1 / phi))) = 0 is not verified by
what I figure out with this spreadsheet on my Excel Trigonometry.
- December 4, 2006 -

"Phi Figures" - a set of figures calculated with phi
and trigonometric function - is added on this spreadsheet.
- November 21, 2006 -

YouTube - Fibonacci & Golden Mean - Part 1/6

    The Pentagon and The Pentagram
- October 22, 2006 -

A group of 12 connected pentagons make a dodecahedron.
A pattern was designed and drawn on this spreadsheet to cut and fold
to make a dodecahedron dice.
Thus polyhedron like dodecahedron will be explored with Excel
to use polygon like pentagon as building blocks.
- December 14, 2006 -

     Phi-by-Phi Square - as there seems to be no naming established for this,
I would like to call this Golden Square.
Golden Square in London

- October 25, 2006 -

     Exploring Pi with Trigonometry
PHI^n-2 + PHI^n-1 = PHI^n
- This is Fibonacci Golden Ratio as shown in the spreadsheet.
Try entering "=PHI" or "=PI" and "=SIN( *degrees)" on the "PHI Park" sheet.
- November 8, 2006 -

     Exploring Phi-by-Phi Squares with Excel Trigonometry

- November 14, 2006 -

     Phi^10-by-Phi^10 Rectangle and Progressive Difference shows how I am
going to theorize my "Phi-by-Phi Golden Rectangle".

- November 16, 2006 -

     Vector in Octagon

- November 23, 2006 -

     Vector in Pentagon

- November 25, 2006 -

Excel Vector Trigonometry

- November 25, 2006 -

     Pentagon and Dodecahedron

- April 30, 2007 -

     Pentagon and Phi

- May 3, 2008 -

      

Reference

Excel Tutorial on Trigonometry	06/09/02
Trigonometric function - Wikipedia
Trigonometry of right triangles
Google & Excel