One-third 2872

The cycling racetrack has the shape of a circle with an area of 2 ha. How long will a cyclist drive one-third of a kilometer in a perimeter?

Correct answer:

t =  1.504 min

Step-by-step explanation:

S = 2 \cdot \ 10000 = 20000 \ \\ r = \sqrt{ S/\pi } = \sqrt{ 20000/3.1416 } \doteq 79.7885 \ \\ s = 2 \pi \cdot \ r = 2 \cdot \ 3.1416 \cdot \ 79.7885 \doteq 501.3257 \ \\ t = #min#S = 2*10000 \ \\ r = sqrt(S/pi) \ \\ s = 2 *pi*r \ \\ t = s/(1000/3)t = s/(1000/3) = 501.3257/(1000/3) = 1.504 \ \text{min}



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