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Physics question? (Uncertainty)?

What is the area, and approximate uncertainty, of a circle of radius 3.8 * 10^4 ?

I got the area: (4.5 * 10^9 cm^2)


Is this uncertainty correct???

2.2%

I got it by doing

(10^8)/(4.5*10^9) * 100

Did I do something wrong or is it correct?

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