Posted by krysta on Thursday, March 1, 2012 at 3:33pm.
just plug in the numbers:
A = πr^2
= π*(3.45*10^10)^2
= 3.1416*11.9025*10^20
= 37.39*10^20
= 3.739*10^21
we're not solving anything, just evaluating an expression
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