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r₁=6mm
2r₂=2mm
r₂=1mm
P=πr²
P₁=π*6²
P₁=π*36
P₁≈3,14*36≈113mm²
P₂=π*1²
P₁≈3,14*1≈3,14mm²
a)
3,14/113≈0,02
b)
113-3,14≈109,86