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

Solution:

a=2 dm→ cm=2⋅ 10  cm=20 cm a=o/6 o=6⋅ a=6⋅ 20=120 cm  o=2a+2b  b=o/2−a=120/2−20=40 cm

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