Golden Ratio

2 * cos (pi/2) = (1 + 5^0.5)/2 = 1.6180339etc.

No longer do I have to memorize the dimensions of a triangle whose one angle is 36

degrees.

Wolfram Alpha has the answer for me:

http://www.wolframalpha.com/input/?i=cos(36deg)

Next

2 * cos (pi/2) = (1 + 5^0.5)/2 = 1.6180339etc.

No longer do I have to memorize the dimensions of a triangle whose one angle is 36

degrees.

Wolfram Alpha has the answer for me:

http://www.wolframalpha.com/input/?i=cos(36deg)

Next