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a) P=pi*8^2-pi*4^2=64pi-16pi=48pi
b)P=pi*(8:2)^2-pi*(2:2)^2= pi*4^2-pi*1^2=16pi-pi=15pi
c) P=pi*(6+4)^2-pi*6^2= pi*10^2-36pi=100pi-36pi=64pi
d)pi*(5+2:2)^2-pi*(2:2)^2= pi*(5+1)^2-pi*1^2= pi*6^2-pi=36pi-pi=35pi