Circular 5129

When the runner goes around the circular stadium five times, he runs 157 km. What area does the stadium occupy?

Correct answer:

S =  78.4602 km2

Step-by-step explanation:

o=157/5=5157=31.4 km r=o/(2π)=31.4/(2 3.1416)4.9975 km S=π r2=3.1416 4.99752=78.4602 km2

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