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2π=2πr
2*3=2*3*r
6=6r
r=1
P=πr²
P=3*1²
P=3 m² - powierzchnia stołu
Ф=2r
Ф=2
Ф=a√2
2=a√2
a=2/√2
a=2*√2/√2*√2
a=2√2/2
a=√2
P=a²
P=√2²
P=2 m² - powierzchnia serwetki
3 -100%
2 - x%
x=2*100/3
x=200/3
x≈66,7%