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2π*1,3dm=2,6π dm
czyli 1.69*pi = pi*r^2 r^2 r do potęgi 2
pi się skraca
1.69=r^2
r=pierwiastek(1.69)=1.3
r=1.3 dm
Zatem obwód
2*pi*1.3= 2.6*pi dm
Pole koła
P=π × r²
Obwód koła
Ob= 2π × r
P = π × r²
1.69π = π × r²
1.69 = r²
r = 1,3
Obw = 2π × r
Obw = 2 * π × 1,3
Obw = 2,6π