Question

I know that 1 m^2 = 1 * (10^4) cm^2 = 10000 cm^2 So now why...

I know that 1 m^2 = 1 * (10^4) cm^2 = 10000 cm^2

So now why is 100 um^2 = 100 * (10^-8) cm^2 = 1 ucm

I think it should be 100 * 10^-6 * (10^4) cm^2 = 1 cm^2

Which one is the correct answer since everyone around is saying it is 100 * (10^-8) cm^2  

Explain please

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