trig
posted by Mani .
1=2pi times the square root of (L/9.8)

trig 
Damon
Period of pendulum = 1 second what is its length ?
1^2 = (2pi)^2 L/9.8
L = 9.8/(2pi)^2
L = .248 meters or 24.8 cm, about 10 inches
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