




A pendulum is a bob (or weight), suspended from a pivot by a rod, so that it may swing freely back and forth when it is displaced from its equilibrium position (or low point).
The period of a pendulum is the time it takes for it to travel from point A to point B and return to point A.
This formula works well provided that the pendulum's angle from the perpidicular (amplitude) is no greater than 10 degrees, but when it becomes greater than 10 degrees, the formula becomes much more complex:
Fortunately, an exact formula has been discovered for a pendulum's period and it involves taking the arithmetic geometric mean 
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