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r = 1,2 m = 120 cm
s = 40 cm
θ =__?
K = πr²
K = 3,14 • 120²
K = 316.800/7 cm
s = θ / 360 • K
θ = s • 360 / K
θ = 40 • 360 / (316.800 / 7)
θ = 7 / 22°