Question 1124490
.
<pre>
T = {{{2*pi*sqrt(L/g)}}}  ====>  square both sides  ====>


{{{T^2}}} = {{{(2pi)^2*(L/g)}}}


{{{(T^2*g)/(4*pi^2)}}} = L


L = {{{(T^2*g)/(4*pi^2)}}} = {{{(5^2*9.8)/(4*(3.14159)^2)}}} = 6.21 meters = 621 centimeters = 621 cm.
</pre>