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obwód 6cmx424cm
r = ½a√2
r = ½6√2
r = 3√2
l - obwód koła
l = 2 πr
l = 6√2π
P = πr²
P = π(3√2)²
P = 18π
d=6√2
r=6√2 /2 = 3√2
r=3√2
Pk= πr(do kwadratu)
Pk = π x (3√2)(do kwadratu)
Pk=18π
OBW= 2πr
OBW= 2 x π x 3√2
OBW= 6√2π