Quarter of a circle

Calculate the circumference of a quarter circle if its content is S = 314 cm2.

Correct result:

o =  71.3978 cm


S=314 cm2 S=π r24  r=4 S/π=4 314/3.141619.9949 cm  o=2 r+2π r/4=2 19.9949+2 3.1416 19.9949/4=71.3978 cm

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