How to you turn a number into an answer with pi in it?

Here your calculator gave you the result #0.3926990817#

To make this value an approximate product of #pi# simply divide the result by #pi# - If your calculator does not have a key for #pi# benutzen #3.14159265#

In your example #0.3926990817 div 3.14159265 = 0.12500000014323945 approx 0.125#

Nun beachte das #1/0.125 = 8#

Daher #pi/8 approx 0.3926990817#

Hoffe das hilft.