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.

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You need to know the following knowledge to solve this word math problem:

arithmetic
square root
planimetrics
Pythagorean theorem
circle
perimeter
rectangle
units
length
7th grade (12y)
8th grade (13y)
9th grade (14y)

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