If anybody knows physics and the simple pendulum I need to know the formula (URGENT)

A simple pendulum is one which can be considered to be a point mass suspended from a string or rod of negligible mass. It is a resonant system with a single resonant frequency. For small amplitudes, the period of such a pendulum can be approximated by

where,

T = time period

L = length of the string

g = acceleration due to gravity

The motion of a simple pendulum is like simple harmonic motion in that the equation for the angular displacement is