The parallelogram

The parallelogram has one side 2 dm long, which is one-sixth of its circumference.
How many cm does the other side of the parallelogram measure?

Correct result:

b =  40 cm


a=2 dm cm=2 10  cm=20 cm a=o/6 o=6 a=6 20=120 cm  o=2a+2b  b=o/2a=120/220=40 cm

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