Anytime you find yourself with circles, arcs, pendulums (which swing through an arc), etc. you find Pi popping up.
Look around your house and find something circular: a jar lid, a CD, a plate -whatever you can find that is circular, the bigger the better. Measure its diameter (the width across the center of circle) with the ruler. Now wrap a piece of tape around around the circle and cut or mark the tape so that it is exactly as long as the outer edge (the circumference) of the circle you are measuring. Measure the piece of tape. With a calculator divide the length of the tape by the diameter you measured for the circle. The answer you will get, if you have measured accurately, is always 3.14. It is a constant, 3.14, for any circle you find. (How Pi Works, by Marshall Brain)
About "why 212" and my "confusion", obviously, it tried to be a joke.
Thanks for all your comments
Add photograph to your favorites
Add photographer to your favorites
Photographer found comment helpful.
