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2)(pi*)-(pi*)=10
36pi = pi* r^2 / pi
36= r^2
r=6
P= 2*pi*r= 2*pi*6=12pi
2. r1=15 cm r2=15-3 cm = 12cm
P1= 2*pi*r=2*15*pi=30pi
P2= 2*pi*r=2*12*pi=24pi
24pi/30pi * 100%= 0,8*100%= 80%