Quarter of a circle

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

Correct result:

o =  71.3978 cm

Solution:

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

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