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 answer:

b =  40 cm

Step-by-step explanation:

$$\begin{gathered} a=2\text{ dm}\to \text{ cm}=2\cdot 10\text{ cm}=20\text{ cm } \\ a=o\mathrm{/}6 \\ o=6\cdot a=6\cdot 20=120\text{ cm } \\ o=2a+2b \\ b=o\mathrm{/}2-a=120\mathrm{/}2-20=40\text{ cm} \end{gathered}$$

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