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r=4cm
a=4cm
b=2cm
P₋k=πr²=48cm² pi=3
P₋pr=2P₋p + 4P₋b=2*a²+4(a*b)= 32 + 32=64 cm²
P₋k/P₋pr=48/64=3/4
Odp. Pole kuli jest mniejsze o 0,25.