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January 27, 2015

January 27, 2015

Posted by **megan** on Sunday, May 6, 2007 at 6:37pm.

I thought it was 10 miles.But it says round.So im a little confused.If you could Help.I would be very happy.

the area of a circle is pi * r^2

if the first radius is 40 miles, then the area is pi*1600. the second radius is 50 miles, so the area is pi*2500. 2500(pi)-1600(pi)= 900(pi) additional sq miles of area. and then you multiply 900 and pi to get the answer.

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