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a)
Wzór : l = 2πr
l = 2*π*6 = 12π
b)
d= 16, r = 1/2*d = 8
l = 2*π*8 = 16π
2.
l = 22π
22 π = 2πr |:2π
11 = r
Długość tego promieniu wynosi 11.