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R- (a√2)/2
R-6 pierwiastków z 2 /2 = 3 pierwiastki z 2
Pdużego - (3√2)² * π = 18 π
r=1/2 a
r- 6/2=3
P małego - 3² * π = 9 π
Pzac- 18 π - 9 π = 9 π