Perimeter of the circle

Calculate the perimeter of the circle in dm, whose radius equals the side of the square containing 0.49 dm2?

Correct result:

o =  4.3982 dm

Solution:

S=0.49 dm2 a=S=0.49=710=0.7 dm  r=a=0.7=710=0.7 dm  o=2π⋅ r=2⋅ 3.1416⋅ 0.7=4.3982 dm

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