Theoretical prediction on a simple pendulum?

DrBoY

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I have the experimental data but I need to get the theoretical prediction on a simple pendulum in order to get the percent error. I use this formula but I get a big number,which I think its not correct.

I use this formula

T= 2pi square of root L/G

I have L which is 90.3cm and G,which is 9.8 m/s^2.

What im doing wrong? Should I use another formula? Should I convert the numbers into another unit.
 
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