MATLAB: Area calculation for overlapping region

urgent

I have three overlapping network in a service area with Radius=600,200 and 200. the networks with Radius 200 are inner networks in the service area of radius 600. I use for loop to input radius , and then calculate area. But I don't know how to calculate
As=A1-(A2+A3). where 
A1=pi*600^2, 
A2=pi*200^2, and 
A3=pi*200^2.
please help me

Best Answer

That's the formula for circumference, not area! You need to square the radius
A1 = pi * 600^2
A2 = pi * 200^2
A3 = pi * 200^2
As = A1 - (A2 + A3)
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