Square and circle

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

Result

x =  8.584 cm

Solution:

x=4⋅10−π⋅10=(4−π)⋅10=8.584 cmx = 4\cdot 10 - \pi \cdot 10 = (4-\pi)\cdot 10 =8.584 \ \text{cm}

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