Rectangle and circle

The rectangle ABCD has side lengths a = 40 mm and b = 30 mm and is circumscribed by a circle k. Calculate approximately how many cm is circle long.

Result

x =  157.08 mm

Solution:

x=π⋅ 302+402=157.08 mmx=\pi \cdot \ \sqrt{ 30^{ 2 }+40^{ 2 } }=157.08 \ \text{mm}

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