Square and circle

Into square is inscribed circle with diameter 10 cm.What is difference between circumference square and circle?

Correct result:

x =  8.5841 cm

Solution:

D=10 cm o1=4⋅ D=4⋅ 10=40 cm o2=π⋅ D=3.1416⋅ 10≐31.4159 cm  x=o1−o2=40−31.4159=8.5841 cm

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